Yes, the historical background of Chu Qiao Zhuan should be the Southern and Northern Dynasties. The Northern Dynasties were the Eastern and Western Wei Dynasties, and the Southern Dynasties were the Liang Dynasty, which was called Nanliang or Nanliang in history. In the play, there were three spy groups in the world at that time. The Western Wei Dynasty was in charge of the spy paper eye of the Yuwen family, the secret government of the Liang Dynasty in the Southern Dynasty, and the Hanshan League founded by Luohe, the mother of Chuqiao, a spy group on the rivers and lakes. According to the play, Liang's spy agency "Secret Chamber" was founded by Governor Zhou Yu and has been used by Jiangnan court ever since. To the girder, the head of the secret mansion is princess royal Xiao Yu. Xiao Yu and Xiao Ce should be half-brothers, so they are political enemies. Xiao Yu always wanted to get rid of Xiao Ce and let his own brother take the upper position. Xiao Ce also wanted to control the secret mansion.