At the beginning of the 18th century, the Lee Dynasty of North Korea was during the reign of Yeongjo (Song Kanghao). Yeongzu had a deep love for Ladu. After his eldest son died young, all his hopes were placed on his second son Li Dan (played by Yoo Ah-in). Not only was he crowned the crown prince when he was just born, but he also arranged for famous ministers to supervise his homework. However, things went wrong, and...