In the bustling ancient Chang'an, Su Liulang formed an indissoluble bond with his best friend Du Youran and the heroine Cao Xiaohe due to a chance encounter in a strange case. They were involved in court arrests, struggles between powerful men, and various oolong incidents in the market. While humorously confronting fate and power, they gradually uncovered the truth about Ye Baichuan's unjust case. The three volumes of stories are ups and downs, compact and bright. Each volume is independent and interesting, but also coincides with the main line, showing the growth, friendship and love of young people, and finally working together to face the crisis of their home and country. The story outlines the style of the great era in a humorous and relaxed way, and ends with the people living in peace and justice.