Crown prince Park Jeongseong was chasing down a criminal when he stumbled upon the lost and escaping young lad who happened to wear the same clothing as the culprit and was caught by the guards. Swearing that he wasn't the suspect, Jungwon begged for the crown prince to protect him and that he will find a way to find the suspect telling that he knew a distinct feature the suspect owns which reminded the prince. Along their venture to solve the mystery and the crown prince's walk towards the crown, what will happen if a love that should not have existed took place between a commoner and a heir to the throne?