Soo and Eunhyuk engage in a fierce battle with Seo Yixiu's men.Amidst this, Eun Hyuk kept trying to attack Seo Yi Soo, while Hyun Soo blocked every attempt.A flying monster attracts Hyun-soo's attention, and Eun-hyuk finally throws his stake at Seo Yi-soo.Just when Nam Sang-won was about to stop him, Seo Yi-soo took control of her body.The wooden stake hit her and Minami Aihara was forced out of her body.Hyun Soo moves Seo Yi Soo aside and Slime Young Soo comforts her.Seo Yi-soo apologizes for creating more monsters and asks Hyun-soo to kill Nam Sang-won for her.In a mood of revenge, Hyun-soo attacks Nam Sang-won who has taken over the burned body of Ji-sung.

Hyun Soo destroys the body and Nam Sang Won slips away again.Eunhyuk points out that they can't keep destroying bodies and offers to offer his body to Nam Aihara to kill him once and for all.While Hyun-soo and Eun-hyuk argue about who should be the victim, Nam Sang-won takes over Sang-wook's body again and recovers.Before Sang-wook takes over the body and starts crawling toward the bonfire, Hyun-soo realizes that the confusion in Nam Ai-won's hallucination about Yu-ri in season 2 is because Sang-wook was alive all along.Sang Yu did not allow Nam Sang Won to escape, and both of them were eventually burned to death.Unbeknownst to Hyun-soo, the dying Seo Yi-soo suddenly recovered.Lee Eun-you heads to the ruined Green Home, crying as she begins to turn into a monster.She hallucinates human Eun-hyuk, who hugs her.As for the real Lee Eun Hyuk, he left after Nam Sang Won's death.

Hyun Soo returns to the gym and tries his best to transform the monster into a human.They head to the construction site and everyone is reunited.Chanyoung suggests moving to a safer place, and Ha Ni asks about Eunyou's whereabouts.Hyun-soo suggests moving to a new human's home because Eun-you will likely go there if she evolves.Along the way, the gym survivors encounter a new group of humans.Many people are skeptical of them, but they decide to live together to best protect everyone from the threat of unevolved monsters.Infected people have the opportunity to become new humans, while Jin-ah and Ye-seul teach the new humans how to express themselves.We also see Seo Yi-soo, who has grown up rapidly, and Ying-soo, who has turned back into a human being.

Eun Hyuk tells Hyun Soo that if Eun Yoo comes back, it means that she has become a new human being and may be with other new humans.Hyun Soo promises that if he finds her first, he will restore her human identity and reunite the brother and sister.By the end of the episode, we see Eunhyuk acting more like a human.He finds Eun-yu, who has become a new human being, and calls Hyun-soo.Eunyou barely glanced at them and returned to walking on the roof, listening to music like in the first season.Eunhyuk and Hyunsu looked at her with smiles.