Ran Yan (Zhou Jie Qiong), an 18-year-old noblewoman turned amateur forensic detective, uses her unique skills to investigate a gangland killing after her mentor's gambling debts force her into a bargain. During her investigation, she encounters Su Fu (Pei Zi Tian), a deadly assassin, and Xiao Song (Li Cheng Bin), the Emperor's investigator, who are both searching for a mysterious priceless pearl. As Ran Yan and Xiao Song develop a close bond, she must rely on her investigative prowess and intuition to unravel a complex plot. This is a 2020 Chinese drama series directed by Wu Tian Ge and Ye Tian.