He is a prince whose concubine was deposed and fell out of favor. He is the companion of the princess. He loves him, and his half-sister also loves him. He is poisoned by a strange poison. He takes care of him all the way to win the world. However, his poison penetrates deep into his bones. The intense pain makes him have a dual personality. On the one hand, he suppresses his emotions for his sister. On the other hand, he cannot control the impulsive one and confines him in the palace as a concubine. He loves him and she loves him, but who does he love?