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.

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.

Jun is a top agent of the National Intelligence Service who can strike down dozens of terrorists in one fell swoop. Disenchanted with his life, Jun disguises his death and succeeds in leaving the NIS to lead a normal life as a family man and fulfill his dream of becoming a webtoon artist. However, his unexciting webtoons are ignored by readers and even his wife. Depressed and angry at himself, Jun suddenly draws a webtoon of his past as a secret agent.

Two people overcome ups and downs in their lives to find true romance and make dreams come true at Incheon International Airport.