In the 1700s, the Crown Prince of Joseon (Yoo Seung Ho) fights against Pyunsoo Hwe. It is a organisation that has a lot of power and nobdoy dares to disobey any of their rules. This organisation even control the water of the country. Ga Eun is the woman that Crown Princes love at first sight. Ga Eun also help him to grow as a ruler.