Taemin knows nothing but the palace of the kingdom of Moonhill. Soon he is to inherit his father's throne, but he feels absolutely not ready for it. He only knows the people and the life of the commoners from the stories of his valet Kibum.

In disguise, Taemin sneaks out of the palace to get his own picture of the world outside his golden walls. 

He is captured by a notorious gang of robbers. A manhunt is on for the criminals and the leader, Choi Minho, has a high bounty on his head.