After some investigation and interviews, the police confirm that the female corpse found in a guesthouse in Jiangcheng belonged to an intern doctor from the provincial hospital. During the investigation, Xu Kai, the captain of the Major Crimes Unit, finds out that Lu Ting's parents, who are also police officers, are involved in the case. But as an unbearably tragic past behind the murder surfaces, Xu Kai discovers that there is someone else behind the scenes.