Set during the Joseon Dynasty, Ryung appears as a useless gangster in the marketplace by day, but at night, he transforms into a chivalrous robber who steals from corrupt government officials to help the poor. After each heist, he leaves behind a wooden branch from a plum tree at the scene to take responsibility for his actions. The impoverished citizens know him only as Iljimae. Bong Soon is a hilarious girl with excellent martial arts skills who lives as a con artist. She is devoted to Ryung and sacrifices her entire life for him. Eun Chae, the daughter of a government official, is kind-hearted and often helps those in need. She encounters Iljimae by chance, sparking a sweet love story. However, her affection puts Iljimae in a perilous situation, as an Imperial Guard is also in love with her.
