Jung Wooyoung is a responsible and highly respected police officer in Seoul. One regular day takes a surprising turn when he meets a young girl who turns out to be his ex-girlfriend's daughter from five years ago. Just as Wooyoung begins to understand this shocking news, tragedy strikes: both his ex-girlfriend and their daughter are suddenly kidnapped, leaving behind a mysterious note. As Wooyoung investigates further, he realizes that the disappearance of his loved ones might be conn