After getting alarming news from his fiancée, Cha Min has a mishap and receives an object called Abyss. Go Se-yeon meets someone who says he’s a friend.
Min explains what he did to Se-yeon, who’s in disbelief over her circumstances. Vowing to find her killer, she devises 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 she’s someone else.
Convinced that he’s seen his ex-fiancée, Min is frantic to talk to her, but Se-yeon tries to remind him that he’s not the same person anymore.
After making a horrific discovery, Se-yeon considers using Abyss, and tries to persuade Park Dong-cheol to keep investigating the prosecutor’s murder.
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 in her son.
Se-yeon finds herself seeing Min in a different light after realizing he’s always been by her side. Jang Hui-jin reveals something shocking to Min.
Park Dong-cheol demands to know why Se-yeon keeps interfering with the case, and someone claiming to be Lee Mi-do suddenly appears out of nowhere.
Se-yeon tries to explain her actions to Min and has an emotional reunion with her mother. Hui-jin refuses to back down when confronted by Min’s mother.
Se-yeon senses that she may be in danger. Min shares a secret about his father. Hui-jin’s mother gets agitated after seeing someone on TV.
After Park Dong-cheol alerts him about Oh Yeong-cheol, Min goes looking for Se-yeon. Lee Mi-do’s parents get a perplexing proposal from Min’s mother.
Se-yeon senses something unnerving about Seo Ji-uk. Hui-jin gets an unexpected visitor and has an idea about what Oh Yeong-cheol may be planning to do.
While trying to help Park Gi-man with the hit-and-run case, Se-yeon and Min uncover something odd. Seo Ji-uk is visited by someone from his past.
Seo Ji-uk implements his plan. On his way to meet Se-yeon, Min receives a disturbing call from Park Dong-cheol and grapples with a difficult decision.
Min and Se-yeon set out to obtain evidence against Seo Ji-uk with Park Dong-cheol’s help. Min’s mother questions Se-yeon about her intentions.
After proposing to Min, Se-yeon copes with the consequences of his sacrifice and reveals the truth to her parents. Seo Ji-uk’s trial gets underway.