Seasons & Episode
XuXu is taken hostage by Yang Yu but Ji Bai is able to save her. During interrogation of Yang Yu, the kidnapper, Xu Xu determines that he was determined to kill Shiyong anyway. Attempting to convince Ji Bai of her theories, Xu Xu becomes exasperated. Ji Bai demands evidence and not just speculation, instructs her in correct investigative procedures, finds fault with her assumptions and admonishes her.
Zhao Han stands up for Xu Xu but Ji Bai tells him if she doesn’t qualify for her fitness exam in 3 months, both of them will be dismissed from the team. Yao Meng works with Xu Xu to get her into shape. Ye Corp shows a marked decrease in profits causing major concerns. Xu Xu questions Yang Yu and Ye Zixi further because she believes the kidnapping case is more complex than originally thought.
Xu Xu is startled when Ji Bai arrives. Working together they realize Ye Qiao is covering up for someone. Lanyuan and Zhishan show up to perform ceremonial rites. Lanyuan and Ziqiang are brought in for questioning. After seeing his father at the police station Ziqiang draws a knife and attacks the officers. Ji Bai is cut while saving Xu Xu. They compare notes on who the suspected murderer is.
Evidence proves Zixi’s death was manipulated and she was stabbed while semi-conscious. Ziqiang confesses but Ji Bai doesn't believe she is smart enough to manipulate the murder. Further interrogation proves that Ziqiang did push Zixi over the rail but that she didn’t die from it.
Ye Lanyuan discovers the company was used in drug smuggling. Xu Xu realizes she is in love with Ji Bai when Yao Meng tells her the snail has fallen in love with the lion. Guan Nam and Yao Meng infiltrate the trafficking group. Yao Meng and Zhao Han’s friendship grows. Xu Xu and Ji Bai pose as a couple which makes her self conscious. Ji Bai jokingly says there is no gender difference for a monster.
Yao Meng reproaches herself for what happened to the nurse and Zhao Han. Xu Xu confesses it is her fault for her condition. The disciplinary board decides the interns can remain in the force. Ji Bai’s team is assigned as a Special Investigative team to work with Myanmar's military forces to bring down the Jin Dug group. Yao Meng experiences PTSD upon return to work. Xu Xu qualifies to be a member of the Special Team.
While Xu Xu was dressing his wounds Ji Bai ask Xu Xu if that could be considered blind worship and teases her about her drawings. When Xu Xu goes to get General Po’s approval to transfer Zhishan back to China she is shocked to find he is cruel. Other Major Crimes Division teams captured all of the Jun Din/Lu Ge group members except Jun Din and Zhao Xiao Lu (Lu Ge). Apparently she had received advanced warning.
Zhao Lang sees Xu Xu's signal and picks her up. They follow breadcrumbs of the drawing left by Ji Bai. At the Mekong River Ji Bai collapses. Xu Xu shoots Xiao Lu in the arm before she can kill Ji Bai. Ji Bai goes into a coma. Director Zhan and the border patrol capture Po and Xiao Lu. During Zhao Han and Yao Meng's wedding, Ji Bai arrives to propose to Xu Xu and return Yao Meng’s resignation letter.
Detective Ji Bai and new criminal profiler Xu Xu may seem like an awkward teacher-student pair at first glance, yet they are actually the best partners in the police force, solving one crime after another. Ji Bai slowly falls in love with Xu Xu, yet she is a girl who is as slow as a snail when it comes to love. Just as Xu Xu starts to reciprocate Ji Bai's feelings, the dormant "Angel's Killer" reappears.