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When retired hitman’s wife goes on vacation with her friend, she asks him to look after the friend's teenage daughter. Things go awry when he is forced to use a little violence to protect the girl from juvenile delinquents, but then they are found dead and the girl is kidnapped.
Stuntman Cha Dal-geon gets involved in a tragic airplane crash and ends up discovering a national corruption scandal in the process. Go Hae-ri, the oldest daughter of a deceased marine, decides to work for the National Intelligence Service as a secret ops agent in order to support her mom and younger siblings, although all she wanted to do is to become a civil servant.
During the Japanese colonial era, roughly 400 Korean people, who were forced onto Battleship Island 'Hashima Island' to mine for coal, attempt to escape.
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.
