Because of grandfather's will, Ju Won somehow feel uncomfortable about this flight. He accidentally reunite with a manager of J- one, Gu Reum. After they finished their flight, something shocking happens to Ju Won and Gu Reum.

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.