After Xiao Yunzhuo, the eldest daughter of the Xiao family, who had been living in the countryside for many years, returned to Beijing, she used her outstanding insight and decisive ability to reorganize the family, expel her hypocritical cousin Jiang Ju, educate her naughty younger brother, and guide her sickly second brother to regain his ambition. Externally, she repeatedly solved unsolved cases in the capital, vindicated innocent people, and got acquainted with the three princes and other people who helped her. She gradually revived the declining Xiao family between house fights and detective cases, and established a foothold in the capital with her sober and independent attitude.