Han Qing is a female police officer of the Sanhe Criminal Investigation Team. She was nicknamed "Unhappy" because she was unsmiling and only asked about her work. She and her partner Zhong Wei have cooperated very well for many years. However, Zhong Wei disappeared after tracking a suspect, and there was no news for almost two months. Han Qing handled other cases in anxiety and pain, while not giving up any clues related to Zhong Wei. The new murder case aroused Han Qing's high vigilance. She judged through clues that the murder case was related to Zhong Wei's disappearance. Despite many obstacles in the investigation, the real suspect finally surfaced, and what Zhong Wei had experienced gradually became clear.
