Two ex-detectives who have fallen from grace in the city become patrol officers in a quiet town with a history of a notorious cold case: a serial killer whose signature move is laying cutting off the fingertips of the women he murders. The only suspect that the case ever had is one of the patrol officers, and his partner is here to figure out if he’s a monster who’s responsible for the murders, or a man who became a monster to find out who did it.

Length: 16x70 mins

"What is the right thing, and what is the wrong thing? "Undercover" is the story of Han Jae-Hyun, a man who has been hiding his identity for 27 years. Jae-Hyun's wife became Korea's first CIO(Corruption Investigation Office For High-ranking Officials) chief with the sole purpose of seeking "justice" and goes forward with her principles. Because of Choi Yeon-soo and the people of his past who started threatening Han Jae-Hyun to stop her, Jae-Hyun must protect his beloved wife Yeon-soo and children from them and from his own secrets. Through Jae-Hyun, who constantly asks, "what is the right thing?" and in the process of his desperate struggle to protect his family, "Undercover" tries to tell us what values we must let go of and what we must hold onto in the Republic of Korea, in which values are constantly changing.

Length: 16 episodes