Do-won Kwak

A coup in North Korea forces an agent to defect to South with unconscious "Number One". While operatives from North hunt for both of them, the agent has to work with South Koreans to stop the nuclear war.

Ji Hyeong-do is an assassin for a company that masquerades as a metal trading firm. One day, he takes on a job partnering with a young man (Ra Hun) whom he is to kill afterwards. Ra Hun asks a favor of Hyeong-do, which is to give money to his family. Hyeong-do visits Ra Hun's home where he meets Ra Hun's mother, Yu Mi-Yeon, a former singer whom Hyeong-do admired in the past. Guilt, an unknown feeling up to this point for Hyeong-do, begins to take him over. When Hyeong-do's company realizes that he hasn't taken out Ra Hun as planned, Hyeong-do quickly becomes targeted.

Tae-il is a low-level thug who goes around the streets of his neighborhood in Gunsan, collecting debts for a loan shark and harassing shop owners for the protection money owed to the small gang he works for. He is 42 years old, lives with his barber brother Young-il and Young-il's family, and has never been in love. Tae-il does well at his job and doesn't seem to harbor many scruples about it, but then he meets Ho-jung, a bank clerk who is taking care of her debt-ridden, terminally ill father. During their first encounter, Tae-il forces her to sign a contract that requires her to sell her organs if she can't pay back her father's debt on time. After their not-so-pleasant first meeting, however, Tae-il finds himself thinking about Ho-jung constantly and his conscience begins to get the better of him. He writes a new contract and offers it to her: He will exempt her from the debt if she goes on date with him. The more dates she goes on, the less debt she will have to pay off. Ho-jung rejects his offer at first, but knowing that she is unable to make the payments at any cost, she reluctantly agrees. As they start to go on awkward "dates," an unlikely romance blossoms between the two. Following his prolonged courtship, Tae-il tries to leave the gang life behind him, but the break isn't clean. Unfortunately he is soon diagnosed with cancer and his relationship with Ho-jung is suddenly thrown into jeopardy