After getting alarming news from his fiancee, Cha Min has a mishap and receives an object called Abyss; Go Se-yeon meets someone who says that he is a friend.
Min explains what he did to Se-yeon, who is in disbelief over her circumstances; vowing to find her killer, she comes up with a way to help Min and herself.
Se-yeon and Min are stunned by what Park Gi-man has been doing, and they unwittingly get help from a police detective who thinks that she is someone else.
After making a horrific discovery, Se-yeon considers using Abyss and tries to persuade Park Dong-cheol to keep investigating the murder of the prosecutor.
Park Dong-cheol tries to hunt down Oh Yeong-cheol, who keeps eluding the police; Min's mother doesn't know what to make of the changes she sees in her son.
Se-yeon finds herself viewing Min in a different light after realizing he has always been by her side; Jang Hui-jin reveals something surprising to Min.
Se-yeon tries to explain her actions to Min and has an emotional reunion with her mother; Hui-jin refuses to back down upon being confronted by Min's mother.
Se-yeon gets a feeling that she may be in danger, Min reveals a secret about his father, and Hui-jin's mother becomes agitated after seeing someone on the television.
Se-yeon senses something unnerving about Seo Ji-uk; Hui-jin gets an unexpected visitor and has an idea about what Oh Yeong-cheol could be planning to do.
Seo Ji-uk puts his plan in motion. On the way to meet Se-yeon, Min receives a disturbing call from Park Dong-cheol and struggles with a difficult decision.
