Hometown

Hyung In heads to the Cheonyang Filtration Plant to stop the disaster that is about to occur in Saju. But he becomes tied up by the Youngjingyo believers. There he hears that another gas terror attack that's similar to that of 1987 is about to take place. The people in Saju start to flock around the filtration plant as if they're possessed by something.

A few days after the Cheonyang Filtration Plant incident, Cho Kyung Ho escapes from the institution. Hyung In and Jung Hyun promise to meet up and go look for Kyung Ho together, but she doesn't show up. She only leaves an address for Hyung In. When Hyung In gets there, he sees something he did not expect to see.

Jung Hyun joins Youngjingyo as the next heir who will replace Jae Young. Watching those inside who are merely waiting to face their death, Jung Hyun comes to the conclusion that she needs to take extreme measures. Meanwhile, Kyung Ho, after the release from the prison, pays Kyung Sook, his mother, a visit before the last phase of the experiment. Hyung In at the same time realizes the intention behind Kyung Ho's message. 

By sacrificing herself, Jung Hyun shows the believers that what the proxy is saying is wrong, and the Youngjingyo believers change their minds. Meanwhile, Jae Young follows In Gwan to the Youngjingyo building to save her aunt, and Hyung In goes to Kyung Ho who is waiting for him. When they meet, Kyung Ho makes a final offer to Hyung In that can put an end to this long experiment.