“Undercover” depicts the story of Han Jung Hyun, who has been hiding his identity for a long time, and Choi Yeon Soo, a human rights lawyer who becomes the first head of the Senior Civil Servant Corruption Investigations Unit to fight for justice.
Han Jung Hyun is an agent at the Agency for National Security Planning known for his extraordinary quickness and boldness. He is living with a hidden identity when, during a top-secret mission, he falls in love with Choi Yeon Soo and eventually marries her. Jung Hyun is living as an ordinary husband and father, a happy fool for his wife and two children. However, the secrets of his past get caught in an uncontrollable whirlwind when his wife becomes nominated for a high-ranking government post. This could unravel his tightly woven family, his single most precious priority.