Season 1
“Abyss” is about a man and a woman who tragically die and are given another chance at life through soul-reviving marbles in a magical abyss. Go Se Yeon was a tough, accomplished, and unrivaled beautiful female prosecutor who worked in the Seoul District public Office but gets into a fatal accident and dies. However, due to the mysterious magical marble—Abyss—Go Se Yeon is revived, but now in a totally different appearance. Go Se Yeon now possesses a common appearance based on how “good” her spirit was in her previous life.
The Reason to Live, the Reason to Save Someone
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.
Neither the Living nor the Dead
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.
The Truth Hidden by the Facts
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.
Abyss; Soul Revival Orb
Convinced that he has seen his ex-fiancee, Min is frantic to talk to her, but Se-yeon tries to remind him that he is not the same person anymore.
Murderer vs Revived
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.
Twist: Sudden Turn of Fate
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.
Accomplice, and the Real Culprit
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.
Trap
Park Dong-cheol demands to know why Se-yeon interferes with the case. Someone claiming to be Lee Mi-do appears out of nowhere.
Unrequited Love Strikes Again
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.
Trail of Powder
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.
Hide and Seek
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.
The Moment of Evil
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.
Before the Storm
While attempting to help Park Gi-man with a case, Se-yeon and Min discover something strange. Seo Ji-uk gets a visitor.
Rabbit Sheep
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.
Wanted
Min and Se-yeon set out to acquire evidence against Seo Ji-uk, with Park Dong-cheol's help. Min's mother questions Se-yeon about her intentions.
The Way Home
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 begins.