A detective, Sung-ryeol, is haunted by guilt after a car accident claims the life of his daughter. He's having an affair with his colleague's wife, and the weight of his secret drives a wedge between him and his own wife, Ji-yeon. When Ji-yeon returns home late and injured, Sung-ryeol's curiosity is piqued. Meanwhile, a murder investigation unfolds, and evidence points to his wife's involvement. As tensions rise, an unknown man appears, claiming to know Ji-yeon's secrets, further complicating the situation.
Secret
A detective, haunted by a tragic past, investigates violent crimes while grappling with a dark secret and the guilt of losing his own daughter in a car accident.
