A child abandoned in a subway coin locker is sold to a ruthless and calculating loan shark and gangster boss dubbed “Mother” (Kim Hye-soo), who runs an organ-harvesting ring in Incheon’s Chinatown. Named Il-Young (Kim Go-Eun), the baby girl grows into Mother’s loyal right-hand enforcer and is groomed to be her eventual successor. But when Il-Young’s loyalty to Mother wavers, the clash between the two unleashes a merciless tidal wave of blood-soaked retribution and strife.

In an insurance company, Yoon, who is an outsider, has a power to see people’s past and read their minds. Mr. Park, Yoon’s boss, assumes that she has some kind of special power, decides to test her ability. At very late night when everyone has gone home, Mr. Park brings Yoon to a storage room where there are full of case reports. Among them, Mr. Park picks three doubtful cases. He asks Yoon to tell him what exactly happened. Yoon, who senses some dark aura wandering around him, tells the story of each case. Every time Yoon finishes each case, the dark aura gets darker and bigger and Yoon tries to warn Mr. Park about it. Would Mr. Park able to escape from the dark aura?

Ji-wook is a cold-blooded detective who would brutally assault and stop at nothing to catch criminals. However, despite her perfectly masculine appearance, Ji-wook struggles with a secret desire to be a woman. At last, Ji-wook decides to transition. However, a gang Ji-wook brutally arrested by force plots revenge against him. While Ji-wook resigns and secretly dreams of transitioning into a woman, people close to her get caught up in a conspiracy and killed. When the one person he must protect, Jang-mi, also falls in danger, Ji-wook faces a crossroads in making his choice.