In the previous life, he was Di Xin, the great king of the Shang Dynasty, and she was Daji who followed him all the way.
But in this life, he became Ji Gongyan, the emperor of Zhou Dynasty, and she became Bao Si.
She tried her best to destroy Ji Gongyang and his Zhou Dynasty to avenge Emperor Xin, but in the end she discovered that he and she had been at the same point all along.