Weary from his wife's repeated suicide attempts, the husband seeks help from a secretive agent who an old doctor introduced to him. In the middle of the night, "they" come to his house.
A group of professional con artists scam poor, unsuspecting citizens with fraudulent bank loans. The scams go well for a while, but then they begin to distrust each other.
Major crimes unit detective Seong-jin arrests Tae-sung for petty crimes, but shocked to find out that he is the notorious serial killer. However, Seong-jin becomes doubtful of his identity as the serial murder case is investigated.
