This is a historical drama that takes place during the Joseon dynasty. Our main character is known as Iljimae. Iljimae is a mysterious thief who robs corrupt government officials to give to the poor. He's kind of like Robin Hood. He not only steals materials and treasures, but he also helps the wrongfully imprisoned and criminals hiding from judgment. At each scene of robbery, he leaves a small painting of a branch of red plum blossoms. Citizens support him but the king and nobles want to catch him.
When he finds a conspiracy that deals with his father, he decides to use Eun Chae. Eun Chae is the daughter of a government official and he wanted to use her to get the information he needed. However, he fell in love with her. So he is faced with a dilemma of his mission for revenge and for this contradicting love relation with Eun Chae.
The ending was a bit confusing as they did not have time to complete the filming of the last episode and so they used some scenes from episode 1.