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.

An ex-boxer desperate to connect with his only son gives him a gift on his 21st birthday that will change their lives forever.

A son to a high-ranked official in North Korea commits a series of murders going across the countries around the world. The movie depicts the following events as South Korea, North Korea and Interpol start chasing down after him.