The emperor asked to marry his sister, but he asked to marry his sister. She was originally sent to monitor him, but she was too lazy to participate in these intrigues. She just wanted to live in peace for herself. However, the country was in turmoil, and her relatives were facing each other with swords, forcing her to betray her husband. How should she choose between loyalty to her lover and filial piety to her parents? One is a black-faced emperor and prince, and the other is a Buddhist general's daughter. They go up the mountain of swords and go down to the underworld, wishing to stay together.