In the kingdom of Great Wei, hidden ambitions for domination spark a devastating war that wipes out the Moon Clan. Years later, war hero Prince Zhao He faces a life-threatening illness, and a mysterious slave named Yi Jiu, whose blood can neutralize toxins, is brought to save him. Moved by her plight, Zhao He defies tradition and keeps her as his bride. As secrets unfold, a woman named Yun Yao, posing as an ally, seeks to uncover Zhao He's lost memories and the truth behind the Moon Clan's tragic fate.