Yingxiu (Jang Keun Suk) was originally the child of the harem Shuyuan Fushun (Yin Zhenxi), but he was forced to live among the people just six months after he was born, and became a prince who grew up among the people. The man who adopted Yingxiu was a thorough gambler. Under the influence of his adoptive father, Yingxiu became the number one fraudster in North Korea when he grew up. Although the days of living with his adoptive father were difficult, Yingxiu was very grateful to his adoptive father for his shelter and upbringing. Therefore, after his adoptive father died, the sad and angry Yingxiu was determined to avenge his adoptive father, so he entered the court again and finally learned his true identity. Being used as a bargaining chip for political transactions is a fate that every prince and noble cannot escape, and so is Yingxiu. He assisted his younger brother Li Yingzu (Yeo Zhenjiu) and confronted Minister Li Linzuo (Jeon Kwangryul), and finally made Li Yingzu successfully ascend to the throne.