Cen Yu, who was picked up by the unpopular Ninth Prince when he was young, grew up together with Ninth Prince Wan Qijue. They tolerated each other step by step in the deep palace and supported each other. A few years later, the outcast Cen Yu was astonished by his demeanor and appearance similar to that of the Ninth Prince. He was able to defeat the Eight Extremes with his ability and skill, and finally won the title of legitimate son after a struggle. With the rise of the throne and the change of status and class, the only two people who trust each other have many misunderstandings and conflicts gradually arise. But at this moment, a woman broke into Cen Yu's heart, making him finally understand what he loved. Little did they know that this love network that had been arranged long ago trapped three people...