After receiving a phone call, Lin Yan rushes to the psych ward to visit Mrs. Chen, Chu Nan's mother. Unable to cope with the grief Chu Nan's death left her, Mrs. Chen takes it out on the people surrounding her, injuring Lin Yan in the process. Back at the police station, everyone breaks down the deaths of Li Shiping and Sun Xiangming, with no clues about who the person in black may be. Song Yuhang, a woman of logic and reasoning, is stumped by not only the development of the case but the anomaly in the form of Lin Yan.