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.