Nam Ji-woong

A man joins the national army as a soldier who does haircuts for other soldiers. However, he feels frustrated for being on miscellaneous duties rather than what he was conscripted for.

While his girlfriend is away on a trip, retired assassin Bang Ui-kang is tasked with looking after her friend's 17-year-old daughter. After a street attack, Bang Ui-kang becomes embroiled in a murder investigation and dangerous trafficking gang.

Joon-seok is sent to prison for his involvement in Dong-soo's death. He meets Dong-soo's son in prison, keeps his identity a secret, and agrees to join forces when he is released. All of their plans fall apart when Sung-hoon finds out the truth.