By thirteen, investigative prodigy Huang Zi Xia had proven herself by aiding her father in solving confounding crimes. At seventeen, she’s on the run when accused of murdering her family to escape an arranged marriage. Now, she is out to unmask the killer and clear her name. Seeking the help of Li Shu Bai, Prince of Kui, he asks her to go undercover as his eunuch to stop a serial killer and defy a curse destroying his life. Zi Xia is put to the test when Li Shu Bai’s betrothed vanishes. With a distinct golden hairpin as her sole clue, Zi Xia investigates—only to discover that she isn’t the only one in the guarded kingdom with a dangerous secret. (Source: DramaWiki) ~~ Adapted from the novel "The Golden Hairpin" (簪中录) by Ce Ce Qing Han (侧侧轻寒).