The story revolves around two twins who have the same face but have completely different destinies. Her elder sister Jin Qingyan was adopted by the prime minister and became a concubine in the palace, while her younger sister Ge Ta was raised by the Donghu people and trained as a killer. In order to further expand the territory of Donghu and obtain more resources from the Central Plains, he sent a group of assassins including Ge Ta to sneak into the palace to assassinate the emperor. By chance, Ge Ta discovered that there was someone who looked exactly like him, so he put Jin Qingyan under house arrest and pretended to be him to win the emperor's trust and wait for an opportunity to assassinate the emperor. Who knew that Ge Ta, after going round and round, actually fell in love with the son of Huang Tian, and as smart as the emperor, how could he not know that his concubine had already been stolen from a dragon and turned into a phoenix. It's just that the more I get along with this woman, the more I am fascinated by the charm she exudes. She is beautiful and proud, and she seems to express her love for him, but she doesn't take him seriously. He gave her the best things and treated her meticulously, just to prove his importance in her heart, but little did he know that he had already set his heart as an emperor on her...