As Gu Yingtai became drunk, the prelude to a bloody revenge slowly began.Shim Woo-seop was about to reveal the truth to Kang Ha-nae, but unexpectedly met Goo Seok-tae at the stairs.The phone was hung up in a hurry, and the frightened screams made Jiang Hainai realize that the situation was serious. She immediately notified Team Leader Park and the investigators to go to the scene, and she quickly drove there.

In the alley, the appearance of Kim Doki brought a glimmer of hope to Shen Youxie.He and Goo Seok-tae started a fierce fight, while Shim Woo-seop took the opportunity to escape hastily.Goo Young-tae followed closely behind, dragging the iron pipe, blocking Shim Woo-seop in the fabric warehouse and breaking his legs.At the critical moment, the prosecutor rushed forward and tried to subdue Goo Young-tae, but Goo Seok-tae came out of the darkness and stabbed him several times. The prosecutor fell down covered in blood and watched helplessly as Shen Youxie was dragged away by the two brothers..

When Jiang Hanai and others rushed to the warehouse, they only saw police officers carrying out the body of the prosecutor.Kim Do-gi stood in the crowd and witnessed the scene of Kang Ha-nai breaking down and crying.Anger drove Jiang Hainai to break into the private room where Gu Yingtai was. Looking at his crazy smile, she knew that Gu Yingtai was the murderer of the investigator.However, there was no evidence to prosecute him, especially after the case was handed over to other prosecutors, and Gu Yingtai was released for various reasons.Kang Ha Nai was angry and sad, and she decided to take revenge.

After the team members attended the prosecutor's funeral, although they felt resentful about the revenge operation, they still raised their hands to vote in support of the operation out of respect for the victims.They began to investigate the murder without a body and discovered that there was a diving store downstairs from the crime scene.After asking the store clerk, they learned that there was frequent water leakage upstairs, which seemed abnormal.Jin Douji pretended to be a police officer to investigate surrounding stores, and combined with clues provided by others, they found abandoned buckets in a garbage dump near Gu Yingtai's factory. The burn marks on them were similar to those of sulfonic acid evaporation.

After Kang Ha Nai received a call from Kim Do Gi, she remembered that one of the raw materials used by Shim Woo Seop's dehumidifier company was sulfonic acid.Through in-depth investigation, they found that in addition to daily expenses, MH Company also regularly purchased raw material sulfonic acid from Nanshan Industrial Co., Ltd.This discovery reminded them of the serial murder case.In order to confirm the suspicion, the team members quickly rushed to Nanshan Industrial Co., Ltd. to investigate, and the police followed closely.

In the warehouse where Jin Doji placed sulfonic acid, they found Shen Youxie's body, and his internal organs had long been removed.This bloody scene reminded Jin Douji of the scene of his mother's murder. He had difficulty breathing and hurriedly escaped from the warehouse.After calming down, he instantly thought of Gu Yingtai's murder motive.Sure enough, he saw two employees in another operating room about to remove organs from living people. Fortunately, he stopped them in time.

Although Gu Yingtai escaped, the police are still hunting him throughout the city.Bai Lumi was furious after learning about the incident through reports.Although she founded an underground business of organ trafficking, she never harmed ordinary people.After realizing that her secretary Goo Seok-tae had betrayed her, she decided to catch the traitor with her own hands.Zhang Shengzhe agreed to her request, but Jin Daoji still had concerns.The next morning, they installed surveillance cameras near the hotel to wait for Bai Lumi's actions, but they did not expect that she would set up a trap to tease Zhang Shengzhe.When they realized it, Director Park and others had been locked in the basement and Bai Romi escaped with his men.