The story begins with an unexpected incident of matching clothes. Two people born on the same month and on the same day not only fell in love with the same man, but also often bought the same style of clothing.They were love rivals when they were young. Over the past 10 years, they had been using clues on Facebook to imagine that the other person had a better life and felt jealous. Unexpectedly, they reunited unexpectedly.

When there are only one percent of the population left on earth, do we really think that the amount of poisonous gas emitted will also be reduced to one percent?If the human population halved, what would happen to the survival rate of forests?These questions make us wonder whether we should value and protect the future of all living things more.

Imagine what it would be like if alien parasites suddenly descended on the Earth, invaded human bodies, and then started killing people at music festivals.Zheng Xiuren met a man in the supermarket who claimed to kill everyone. She only thought he was a difficult customer.However, after get off work, she was attacked with a knife by the man. Fortunately, the parasite attacked him first.This strange situation also confused the police. The original attacker turned out to be the deceased.What's even more strange is that Jung Soo In clearly suffered stab wounds, but after being sent to the hospital, he was told that these wounds were not made today.

When Zheng Xiuren woke up, she was confused that there were no stab wounds on her body, and she was also puzzled by the sudden death of the murderer.But she was sure she had been stabbed, because she was very familiar with the feeling that something bad had happened again.It turned out that when she was ten years old, she suffered domestic violence from her father, and it was her uncle who saved her.However, in fact, it was Jung Soo-in himself who called the police to report his father.A few months later, Seol Qiangyou launched an attack on Yeongdeungpo's boss, but the mission did not go smoothly and he had to flee.After returning home, he found that his sister was scary in her white dress, and learned from Jin Hee that her sister might be related to an organization called “Church”.

This “Church” is actually an organization composed of monsters that lure humans to join.Xue Qiangyou accidentally discovered the existence of this organization and discovered that his sister was also a member of it.When he secretly followed his sister, he discovered that Jung Soo-in was also being followed by a parasitic beast.It turns out that they are all of the same kind, and they hope that Zheng Xiuren will join the organization because only cooperation can survive.Xue Qiangyou witnessed all this and was panicked when faced with Zheng Xiuren who had turned into a monster.However, the parasitic beast did not kill Xue Qiangyou, but ordered him to do something.That is to tell Zheng Xiuren, never approach those who have brainwave sensors, and never follow them.Xue Qiangyou explained in the way of monsters that Zheng Xiuren's mind was originally going to be occupied by the monster, but because the injury was too severe, the monster could not eat her brain and occupy it.Therefore, Jung Soo In is regarded as a “variant”.

After returning home, Zheng Xiuren was confused about whether there was someone else inside her.Unexpectedly, after the five-minute clip, the self in her body actually had a text conversation with herself!He even told Zheng Xiuren all the truth.The next day, a special search team came from the police station. All security guards were at the highest level and the security was tight.Cui Junjing explained that the X-rays taken for everyone in the morning showed that there were no parasites in the entire police station.However, no one at the scene could figure out what she was going to do.Choi Joon Kyung explained that a parasite had appeared since the music festival, and that parasite was at the scene!

This parasite was captured by “Gray Team”.The larvae of this parasitic organism invade through the ears, nose and mouth of humans and take over their heads, essentially eating their brains.The mutated parasites follow their instincts and their only purpose is to eat humans.Their characteristic is that they can change their head shape at any time and transform into sharp knife-like weapons.These cells themselves are living entities that can think independently, and the synchronized parasites will completely control the human brain.Because of Jung Soo In's original serious injury, the larvae were forced to heal her body first without fully occupying her brain for synchronization.Therefore, the parasitic beast can only control Jung Soo-in when she is in danger to protect the common body.

However, the parasite in Zheng Xiuren's body could only maintain its will for fifteen minutes.Therefore, the monster intends to protect this body and maintain life for this limited time.Choi Joon Kyung said the way to identify monsters is to pull out their hair.As long as it is separated from the host, its hair will quickly dry up, which means it is a monster.And Cui Junjing's monster husband is her pride.The helmet on his head sprays the parasite's most disgusting chemicals, making the parasite unable to react and only feeling pain.The reason for keeping this monster alive is to find the existence of other monsters through the unique brain waves among monsters.Therefore, Choi Joon Kyung’s monster husband is like a “hound” radar.Zheng Xiuren was warned by the monster inside her body that once her kind discovers that she is a mutant, she will definitely be eliminated.

Xue Qiangyou repaired Jin Xi's cell phone, hoping to find clues to the connection between his sister and Ji Shi.However, Jishi also couldn't contact Jinxi, which made Xue Qiangyou anxious.The owner of the mobile phone store revealed that someone has been looking for Xue Qiangyou recently, and the news quickly spread to the ears of the gangsters in Yeongdeungpo.After a fierce chase, Xue Qiangyou contacted his gang partners and reported the situation.However, he decided to stay here and continue to search for the mysterious church and the whereabouts of his sister.

At the same time, Cui Junjing's fan Jiang Yuanshi became very interested in the work of the Gray Team.After learning that Cui Junjing hopes to contribute to mankind, Jiang Yuanshi hopes to join the Gray Team to help find parasites.The report provided by Jiang Yuanshi mentioned the attempted murder case in the supermarket - the Jung Soo In incident.Jiang Zhemin began to suspect that Zheng Xiuren was related to parasites, so he secretly pulled out her hair for examination.Jung Soo In felt the presence of brain waves, but tried his best to stay calm in front of Jiang Zhemin.

One night, Zheng Xiuren was taken away by people from the church.The parasitic beasts need talented ones like her to teach everyone to imitate human expressions.Xue Qiangyou happened to come to the church for surveillance and witnessed Zheng Xiuren's arrival.In the church, Zheng Xiuren learned that the police had captured their kind as bait and captured a parasitic beast at the music festival for study.The priest believes that the strength of humans lies in their willingness to sacrifice for the organization. This is loyalty to the organization and the reason why humans are stronger than parasitic beasts.

Parasites cannot reproduce, so they must create organizations like humans and contribute their abilities.This is the only way for them to avoid being slaughtered by humans and survive.Xue Qiangyou came to a warehouse next to the church and found that it was filled with human bodies, including his sister's body.Shocked and grieved, he immediately took up arms to attack the parasitic beasts that came to the warehouse.The huge noise attracted the attention of the parasitic beasts in the church, and the priest ordered them to hunt down the human.The pastor also noticed something different about Jung Soo In because she seemed to have emotions.

In the chaos caused by the parasitic beast's attack on Xue Qiangyou, Xue Qiangyou escaped with Zheng Xiuren.A parasitic beast chased Xue Qiangyou, and Xue Qiangyou mistakenly thought that Jiu Min was here to help him, but later found out that Jiu Min was the one who tipped off and wanted to kill him.In the fierce fight, another parasitic beast joined in, making the argument between Xue Qiangyou and Jiu Min even more intense.At the same time, the parasitic beast in Zheng Xiuren's body appeared and started a duel with the parasitic beast that came over.In the end, Xue Qiangyou's car got stuck in a tree and was about to fall off the cliff.After Zheng Xiuren woke up, she decided to save Xue Qiangyou. The parasite in her body came out to save Xue Qiangyou to ensure her life safety.At the same time, Choi Jun-kyung discovered the secret that Jung Soo-in was a parasitic beast.

In the past, Cui Junjing's husband was invaded by parasites, and she had to subdue him with her own hands, which became an eternal pain in her heart.Now, after Seol Qiangyou and Zheng Xiuren survived, Xue Qiangyou suggested that Zheng Xiuren and the “Heidi” in her body go to the police and let the police know about the bodies in the church.However, because Jung Soo In's identity cannot be exposed, they can only call the police anonymously.Xue Qiangyou's anger towards the parasitic beast could not be quelled because his sister turned into a monster and his sister was also killed.

After Seol Qiang-woo called Kim Cheol-min, he suggested that Jung Soo-in hide to ensure safety.Kim Chul-min struggled with whether to believe the call to the police, but Detective Kang thought he should report it to the Gray Team first.The Gray Team and the police then headed to the church's stronghold, but the living parasite did not feel any similar brainwaves.Cui Junjing suspected that the living parasitic beast might be lying, so he sent a team to the warehouse.

In the warehouse, they found many broken corpses, which was obviously the canteen of the parasitic beast.Although no parasitic beast was found at the scene, Cui Junjing noticed that Kim Cheol-min put the keys on the ground into his pocket. On this set of keys was a pendant that Kim Cheol-min gave to Jung Soo-in.The Gray Team also learns that the head of the church, Kwon Hyuk-ju, and his wife disappeared a few weeks ago, and that the church people seemed to have only taken away important things.Cui Junjing began to doubt Jin Zhemin's behavior, but she chose to observe silently.

What no one expected was that Detective Jiang was the one who disclosed the information to the church.Detective Jiang expressed his confusion in front of the parasitic beast about the mutual betrayal and killing of similar species.Kwon Hyuk-joo ordered Detective Kang to remove the hounds to ensure that their whereabouts and whereabouts would not be discovered.This task needs to be completed by Detective Jiang, who is a human, in order to avoid arousing human suspicion.

Kim Cheol-min contacted Jung Soo-in hoping to meet, and this move was also controlled by Choi Jun-kyung.Jin Zhemin just wanted to know what happened when Zheng Xiuren went to church. He was worried about Zheng Xiuren's safety, especially because there was an unknown Xue Qiangyou beside her.When Cui Junjing brought the hound to Zheng Xiuren's location, she immediately sensed it.

Cui Junjing pointed his gun at Zheng Xiuren, and Xue Qiangyou quickly escaped with Zheng Xiuren.Xue Qiangyou used his familiarity with the terrain of the old amusement park to deceive Cui Junjing.At this time, Heidi appeared to fight against Cui Junjing, but she did not expect that Zheng Xiuren was surrounded by the gray team, so she fainted.Xue Qiangyou went outside to steal the car, while Detective Jiang took the opportunity to stay outside to eliminate the hounds.This scene was seen by Xue Qiangyou. When Cui Junjing found out that the hound was killed, she vented all her anger on Zheng Xiuren and took her away.

Choi Jun-kyung claimed that Soo-in was a parasitic beast, but Kim Chul-min strongly denied it and submitted a test report stating that Soo-in's X-rays were normal.The police headquarters asked them to transfer Xiuren to the headquarters first, and planned to disclose the news about the parasitic beast to the people.

In Xiuren's subconscious, Heidi appeared to talk to her, saying that the current situation in the outside world was very dangerous. Heidi was afraid that Xiuren would not be able to bear it, so she put her into a deep sleep first.Heidi began to take Xiuren to review the important moments of her life. When Xiuren's parents divorced, she became her father's punching bag. Until Xiuren could no longer bear it, she called the police and arrested her father. What she heard was that the neighborsThe neighbor talked about how this child was so scary. He called the police to arrest his father and treated her as a monster, but Xiuren just wanted to survive.But when Xiuren went to find his mother who had left home, he found that she had remarried and had a child. Seeing Xiuren's disgusted expression when she appeared, Xiuren was hurt again.

However, Heidi explained that Xiuren's mother's behavior was caused by the violence of her husband at home. Therefore, she had such a reaction when she saw Xiuren. It was not because she disliked Xiuren, but because she hated thinking about this past experience.Xiuren also said that being parasitized by Heidi was proof of her bad luck. It would be fine if she was eaten and her brain was controlled. Now that she is symbiotic with Heidi, she becomes a monster again.

The police confirmed the information of Xue Qiangyou who was following Xiuren. Jin Zhemin immediately went to find Xue Qiangyou and immediately caught Xue Qiangyou at the bus transfer station.Xue Qiangyou said that there was a parasitic beast in the police station disguised as a policeman, and told Jin Zhemin the scene where he saw the hound being killed. He also said that Jiang Yuanshi was that person, which surprised Jin Zhemin.At the same time, Kang Won-seok also once again informed that the banned Hyuk Joo Soo-in was about to be sent to the headquarters.

On the way, Jin Zhemin listened to Xue Qiangyou's story about everything, and confirmed that Xiuren was now a parasitic beast, but she still retained her personality.Jin Zhemin told Xue Qiangyou that Xiuren would be transferred to the General Administration today, and that he would be dead at that time, and asked Xue Qiangyou if he wanted to go with her to save Xiuren.Although Xue Qiangyou initially planned to ignore the matter, he finally decided to go with Jin Zhemin to save Xiuren.Jin Zhemin told Seol Qiangyou how to enter the police station, change into the uniform of the special forces, and sneak into Xiuren's location secretly. However, he did not expect that Cui Junjing planned to leave early. Seol Qiangyou and Xiuren were locked in the same container and transported away. Jin Zhemin immediatelyDrive to follow.

When Seol Qiang-woo and Jung Soo-in sought refuge from the cornerstone, they accidentally revealed the true identities of Kim Chul-min and Detective Kang - they were parasitic beasts.Jin Zhemin has quietly sneaked into the police station and colluded with the gray troops. Only Detective Jiang knows about this.Chief Choi Jun-kyung was eager to let the public know about the existence of the monster, called on the public to report the crime, and launched a comprehensive clean-up operation.This task must be completed before the Pengmul Festival, because the opening ceremony of the Choi Yongjae Memorial Hall will be held.Seol Kyung-hee learned about Seol Qiang-woo's meeting with Ji-suk from Jin-hee's cell phone, and Jung Soo-in firmly believed that Choi Jun-kyung must be made aware that the monster has infiltrated the police.Although Seol Qiangyou was worried about not being able to identify the monster, Zheng Xiuren firmly stated that he would not back down.

Kim Chul-min and Detective Kang deliberately revealed the new stronghold of the parasitic beast to Cui Junjing. Although the clues seemed direct and suspicious, Cui Junjing chose to believe it because of time constraints and began to prepare for the eradication operation.Jung Soo-in revealed the true identities of Kim Chul-min and Detective Kang to Choi Joon-kyung, but Choi Joon-kyung proposed to cooperate with them.Xue Qiangyou learned Jin Xi's dying information from Ji Shi, which made him feel guilty for his evasion.In the city, Xue Qiangyou rescued Zheng Xiuren who was being hunted. Heidi was dissatisfied with Zheng Xiuren's behavior, but Xue Qiangyou understood that this was her way of survival.While Seol Kyung-hee was searching for Seol Qiang-woo and Jung Soo-in, Ji-suk sacrificed his life to protect them.Choi Joon Kyung was suspicious of Jung Soo In's warning, but still agreed to record it in case of emergency.The success of the sweep operation confused Jung Soo-in, while Choi Jun-kyung became even more suspicious of her rhetoric.Xue Qingxi discovered that the priest had betrayed his kind, and Xue Qiangyou guessed that the leader of the parasitic beast was targeting the mayor.

Detective Jiang is a veteran who is disappointed with his police career. His salary is meager and there is no hope of promotion. Even his family has been affected. His wife complains that he cannot provide a good educational environment for his children.When he was investigating a case, he accidentally discovered that the pastor's wife had passed away and witnessed with his own eyes the horrific scene of the pastor being controlled by a parasitic beast.These parasitic creatures have the ambition to eat humans, and put forward an attractive condition to Detective Jiang: If they can cooperate with the parasitic beasts, Detective Jiang will have the opportunity to sit on the high position he has always desired.Faced with the threat to his life and the temptation of power, Detective Jiang was forced to choose cooperation.

At the same time, Kim Cheol-min publicly claimed that he had eliminated most of the parasitic beasts, intending to stabilize the mood of the citizens and ensure the smooth progress of the opening of the Choi Yong-jae Memorial Hall and the Folklore Festival.He even published the personal information of Jung Soo In and Seol Kyung Hee in an attempt to lure them out.After Seol Kyung Hee saw the news, he decided to cooperate with Jung Soo In to fight against Kim Cheol Min.However, Xue Qiangyou expressed concerns about this and believed that it was too dangerous.In the botanical garden, Heidi suddenly appeared and warned Xue Qiangyou to leave because his revengeful mentality might become a destabilizing factor.

Xue Qingxi expressed her appreciation for Jin Zhemin's strategy. She believed that although the power of an individual is limited, everyone can form a powerful force when united.Therefore, she hopes Heidi can join them to fight against Kim Cheol-min.However, Heidi rejected the proposal, believing that it would be unwise to contact Kim Cheol-min.Xue Qingxi was angry at the betrayal of the leader of the parasitic beast. She was worried that if the mayor's position was occupied by a parasitic beast, it would be more difficult for Zheng Xiuren and Xue Qiangyou to survive in the human world.Although Xue Qingxi and Zheng Xiuren have different philosophies, they both have a common goal: to eliminate the parasitic beast boss.

In order to verify Kim Cheol-min's true identity, Cui Jun-kyung deliberately asked him about finding Jung Soo-in's belongings at the church.She found that Jin Zhemin seemed unable to answer the question, which made her suspicious.In order to eliminate Cui Junjing's doubts, Kim Cheol-min instructed Detective Kang to take action.Choi Jun-kyung discovered that the injuries on Hound No. 1 were caused by a forged murder weapon, which made her even more suspicious of Kim Cheol-min's motives.On the eve of the opening of the Choi Yong-jae Memorial Hall, Kim Chul-min claimed to have received a report that a new church had the same symbol as a parasitic organization.The superior ordered Cui Junjing to lead the gray team to the scene for confirmation. Cui Junjing felt very struggling, worried that this was a parasitic creature's strategy to seize the opportunity.

Heidi called Cui Junjing and told her that the problem she was facing now was that Kim Cheol-min wanted to seize the mayor's position.She and Seol Kyung-hee are stopping Kim Cheol-min's actions and want Choi Joon-kyung to take over the task of getting rid of Kim Cheol-min if they fail.After careful consideration, Cui Junjing decided to return to the festival.Zheng Xiuren explained to Seol Qingxi that the reason why Heidi was waiting for the opportunity to take action was because of her relationship.Due to Jung Soo In's unfortunate choice, Heidi was also affected and unable to change hosts.Therefore, in order to survive, Heidi must first save Zheng Xiuren.Only then did Xue Qingxi understand the reason for Heidi's strength.

Kim Chul-min took action and attacked humans in the form of a monster, but Detective Kang attacked Kim Chul-min instead.It turned out that this was their plan to take the mayor to a designated location.On the other hand, Jung Soo In and Choi Joon Kyung faced off.Jung Soo In said she just wanted to live and didn't want to hurt anyone, leaving it up to Choi Joon Kyung to decide whether to believe her.Xue Qingxi and Xue Qiangyou tried their best to delay the parasitic beast's chance to seize the mayor. In the end, Xue Qingxi decided to sacrifice himself to fight against the parasitic beast boss and let Xue Qiangyou escape.Before that, she apologized to Xue Qiangyou.

The boss of the parasitic beast temporarily parasitized on Detective Jiang. Heidi arrived in time and started a head-on confrontation with the boss of the parasitic beast.During the process, the boss of the parasitic beast mentioned that humans can make sacrifices for an individual as long as they gather strength. He has learned this way of organizing humans and must become the leader to control everything.At this time, Cui Junjing rushed to the scene. She didn't know that the parasitic beast boss had already taken over Detective Jiang's body.But when Heidi discovered that there was a parasitic beast behind her ready to attack Cui Junjing, she protected Cui Junjing without hesitation.At this moment, Cui Junjing discovered through the mirror that Detective Kang had been controlled by the parasite, so he shot him.

Heidi chose to attack the parasitic beast instead of Cui Junjing because she trusted Cui Junjing.She learned from Zheng Xiuren that in order to make people trust, she must first release kindness.Before Heidi handed over her body to Jung Soo-in, she hoped that Cui Junjing could take care of Jung Soo-in, so Cui Junjing decided to send Jung Soo-in to the hospital instead of the gray team.

In order to boost Zheng Xiuren's morale, Cui Junjing brought a letter written by Heidi herself.He sincerely requested Xue Qiangyou to read the words in the letter to Zheng Xiuren in human language.In the letter, Heidi expressed her joy at becoming Zheng Xiuren's host and was glad that she did not completely occupy Zheng Xiuren's thoughts.For her, this is undoubtedly a rare blessing.At the end of the letter, Heidi gave Jessica Jung a message: “Whether you like it or not, you will never be alone.”This sentence is not only an encouragement to Zheng Xiuren, but also a good wish for her future life.

At the same time, in the Gray Team's secret base, a reporter who claimed to be an expert in the field of parasite research came to visit Cui Junjing.However, what is shocking is that this expert who calls himself Izumi Shinichi% is actually the parasitic beast they have been looking for!