Set during the Joseon Dynasty, Ryung acts as a useless gangster in the marketplace by day but at night he is a chivalrous robber who robs corrupt government officials to give to the poor. After each robbery he leaves behind a wooden branch from a plum tree at the site of the robbery to take responsibility for the robbery. The poor citizens only know him as Iljimae. Bong Soon is a hilarious girl with good martial art skills and lives as a swindler. She only loves Ryung and sacrifices her whole life for him. Eun Chae is a government official's daughter and is good in nature and usually helps miserable people. She meets Iljimae once by chance, and their sweet love story begins. However, her love puts Iljimae in a dangerous situation because an Imperial Guard also loves her.
Set during the Joseon Dynasty, Yong acted as a hooligan in the marketplace by day, but at night, he was a thief who robbed corrupted government officials to give to the poor. After each robbery, he left behind a painting depicting a plum tree branch to make his mark and was thus named Iljimae. His main purpose was not so much to rob but to search for the owner of a specially designed sword, which he saw as a child used to kill his father, a loyal subject of the emperor.
Eun Chae is a government official's daughter who, despite her upbringing, has a lot of empathy toward the poor. She met Iljimae by chance and couldn't help admiring him for what he stood for even though she had never seen his face.