Princess Yicheng is the villain in the play. After returning to the grassland, Hayao was caught between Scylla and Charybdis, and there was little Khan's little tricks ahead. He not only humiliated Long song, but also killed Eier, the most important person in Harbin Medicine. He grew up with Hayao, but Hayao didn't do it in the end. Because of his temporary weakness, Hayao gave little Khan a chance. He alienated Hayao in front of Khan and almost killed Hayao.

Miguri, the spy sent by Mrs Jinse, stayed with Long song. Although Miguli was ordered by Mrs. Jinse to rescue her brother, she still entered Ashler's department. Her original purpose was not pure to get close to Ayun, and she was also a slave given to Ayun by Khan. In the play, she has multiple identities.

Because she betrayed Ayun, Khan almost killed Ayun's eagle division, seriously injured Ayun, and led to the massacre of Aodan's family, only his son escaped.

However, the initiator of all this is not a big sweat or a small sweat, but Princess Yicheng. Princess Yicheng's identity is not simple. She was a princess of the Sui Dynasty. After the Sui Dynasty was destroyed, she naturally lost her power and status, so she has been trying to rebuild the Sui Dynasty.

The end of the cordon (Princess Yicheng):

Long song came to see Cheng Yi alone, and Cheng Yi mentioned her rough life. She is just an imperial girl. The most brilliant day in her life was the day when she was named Princess of the Great Sui Dynasty, so she devoted her whole life to the Great Sui Dynasty. Thirty years have passed, and she has been trapped in the grassland for thirty years, but her heart has not left Dasui. Even though Dasui's hometown is still there, her Dasui is gone.

Long song wants Cheng Yi to go back to Chang 'an with her. She believes that Li Shimin will protect Cheng Yi. In this humiliating life, Cheng Yi didn't ask for any redemption or forgiveness, but she still wanted to thank Long song for accompanying her through the last journey. Words fall, yi cheng pushed down the candlestick, wanted to end up with Long song, but Eichler Falcone just arrived outside the palace, and he only flew to the palace, because Long song was still trapped in the palace.