Yifan joins SOD successfully. His first case is a serial killing where the perpetrator has the habit of stealing the victim’s shoelace as his trophy. This modus operandi leads SOD to believe that it is connected to a sexual crime committed 10 years ago. As they try to search for clues from both cases, the perp kills again. This time, he did not wait for 10 years. 一凡成功加入SOD，想不到第一天来报到就遇上一宗连环杀人案。嫌犯每次犯案后都会取走受害者的鞋带，SOD等人不禁怀疑这与10年前一宗相同MO的性侵案有关，试图从双方面找出

Shu Ya discovers the serial killer is using his pet dog to lure the victims, after which he assaults them. They find a suspect following this clue. However the suspect is exceptionally cunning, denying it all. Shu Ya engages in a battle of wit against him. 舒亚发现连环杀手似乎是利用宠物狗来引诱受害者停下，再袭击她们。大家循着这线索往下查，终于找到一名嫌犯。奈何嫌犯十分狡猾，舒亚唯有与他斗智。

Shu Ya entrusts a marital rape and domestic violence case into Guan Lin’s hands, hoping she can handle it professionally. Unfortunately, Guan Lin brings her personal feeling into the case yet again, failing to be objective. Tension rises as their belief system clashes. 舒亚将一宗婚内性侵和家暴案交给关霖负责，希望她能秉公处理。谁知关霖还是忍不住将个人情绪和观念带入其中。舒亚试图纠正，两人一度关系紧张。

A maid goes to the hospital seeking medical attention. The doctor suspects she was sexually assaulted and reports it to the police. However, she leaves the hospital before the police gets there. SOD tries to seek her out and discovers that she is taking care of a dementia old man, raising confusion on who is the real vulnerable party? 一名女佣到医院求医，医生为她检查后发现她下体有撕裂伤，怀疑她遭性侵，于是报了警。然而她却在警察抵达前便离开了医院。SOD成员查出此人身份，得知她负责照顾一名失智老者，不禁令人困惑到底谁才是弱势者？

Guan Lin initiates an investigation about an elderly person being molested. Jun hao and Yifan offer their help, deepening the bond among these three. Meanwhile, SOD identifies the maid’s attacker, but the suspect schemes to persuade the maid to change her testimony. Junhao accidentally discovers that Guan Lin is using police resources to search for her birth mother. 关霖主动提出调查一宗老人被非礼的网络帖文。君豪欲帮忙，一凡也加入，三个年轻人的感情更进一步。与此同时，SOD也找出了性侵女佣的嫌犯。。。

A man is being castrated outside a bar. The team reckons this could be a hate crime or act of vengeance. As they follow the leads, they discover that the victim used to be a teacher and has a criminal record. Meanwhile, Junhao promises to help Guan Lin keep her secret. 一男子在酒吧外被阉割。SOD等怀疑这有可能是hate crime或报复性犯罪。大家随着线索往下查，发现受害者曾经是一名老师，还坐过牢。君豪答应关霖帮她保守秘密。

Guan Lin visits the victim at the hospital and witnesses someone attacking him. The person admits to being the one who castrated the victim, painfully revealing the reason behind it. Suspecting that the victim has not changed his criminal ways, SOD decide to investigate him and bring him to justice

A teenager discovers that he is attracted to children. He tries to be honest with his parents but fails to receive any help from them. The team arrests an old pimp Gao Guang Sheng, unaware that he is Shu Ya's biological father. As the teenager grows older, it is revealed that he is Kuan Weiliang. His parents’ contempt pushes Weiliang to embrace his pedophilia instead, embarking on a path of crime. 少年发现自己恋童，坦白告诉父母后，却得不到他们的帮助。。。

55’s daughter Shanshan starts to take nude photo and watch pornography under the influence of her online boyfriend. Police psychologist Jackie steps in to help find out whether she is being catfished. At the same time, Shu Ya suspects those actors in the pornography could be underage and decides to investigate. Junhao collapses and is hospitalized, Guan Lin takes care of him, bringing them closer. 55的女儿珊珊应网恋男友Shaun要求自拍裸照，还和同学一起看色情片。55请警队心理医生...

SOD discovers that the pornography is being released by a channel called SG Satay. To attract more subscribers, the suspect starts to install pinhole cameras in the women's restroom. While investigating the case, Jun hao's grandmother passes away. The team tries to be his source of support and comfort. Although Yifan has feelings for Guan Lin, he cannot help but notice her affection for Junhao. SOD查出色情片是由一个叫SG Satay的频道所发布。频道主导人为了吸引更多订阅者，毫无道德底线...

After being released from the jail, Chen Yong Ren holds an entire eatery hostage with a gas cylinder. He demands the police to clear him of his attempted rape and murder charges from over 20 years ago. SOD is roped in to investigate. The team re-interview all individuals involved in that case. Meanwhile, police at the hostage scene brings in Yong Ren's daughter to help. 一刚出狱的男子陈勇仁带着煤气桶挟持一家小吃店。他要警方帮他洗脱20多年前的强奸未遂与误杀罪名。应求将SOD拉入调查。舒亚等重新访问当年所有的涉案人。。。

Time is ticking away, the team decides to set a trap to expose the individual involved in Yong Ren's case. Seeing how his daughter is filled with disdain towards his actions, Yong Ren loses all hopes and attempts to ignite the gas cylinder. Guan Lin confesses her feelings to Junhao. SOD因时间有限，只能设下陷阱，让当年的涉案人露出马脚。阿仁因女儿的不谅解，自暴自弃，企图引爆煤气桶。关霖向君豪告白。

A murder occurs in a hotel, and based on the clues left at the scene, it is speculated that the victim participated in sex game before her death. CCTV captures the victim entering the hotel with Guang Sheng. He admits to being the victim's pimp but denies killing her. To avoid suspicion, Shu Ya withdraws from the case. Guan Lin suspects Guang Sheng may be connected to her mother's disappearance. 酒店发生一起命案，从现场遗留的线索推测，死者死前应该是参与了性游戏。。。

Upon interrogation, a suspect confesses to killing the victim in the hotel murder case. However, the described crime process does not match the victim's actual cause of death. The team remains in doubt. Meanwhile, due to trouble created by the victim, Gao Guang Sheng is being hunted down by the people controlling the prostitution ring. 在SOD等人的逼供下，一嫌犯坦诚谋杀了酒店命案的死者。无奈他所描述的犯案过程和死者死因不吻合，案情仍扑朔迷离。高广生因死者的关系，被控制卖淫活动的主使人怀疑，引来杀机。

With Shu Ya's help, Guan Lin finally locates her mother, Wang Jinxiang. She is reluctant to acknowledge her daughter due to years of shame and fear, but eventually gives in after seeing how much Guan Lin misses her. Weiliang kidnaps Qiqi, a little girl that Jinxiang treasures dearly. Qiqi desperately seeks help, hoping to escape from Weiliang's clutches. 在舒亚的帮助下，关霖终于找到母亲王金香。金香原本没脸与她相认，但最后还是难以割舍两人之间的母女之情。伟良拐带一女童琪琪，她正好是金香认识的熟人。琪琪想方设法向外界求救，欲逃离伟良的魔掌。

A member of SOD suddenly disappears. As the search begins, tragic news comes unexpectedly. The entire team is plunged into a state of sorrow and confusion. Detective Wang from the major crime unit is assigned to investigate this case. Weiliang's actions of kidnapping children are exposed. Feeling the pressure, his behaviour becomes increasingly irrational and dangerous. SOD一名成员突然离奇失踪。大家努力寻找的当儿却传来噩耗。SOD上下因此陷入一片愁云惨雾之中。重案组的王警官被安排调查此案。伟良掠童的行径被揭露...

Two little girls go missing at around the same time. SOD and Detective Wang's team must collaborate to solve the case. Time is of the essence as they fear for the girls' safety. Weiliang's wife and family begin to suspect him. The parents of one of the missing girls are famous influencers, they publicly criticize the police, resulting in SOD being removed from the investigation. 两名女童相继失踪。SOD和王警官的团队需一起合作，侦破此案。大家担忧女童们会遇害，分秒必争。伟良的妻子和家人开始对他起疑。。。

The members of SOD decide to defy orders and conduct their own private investigation. They discover that the series of cases are all connected to Weiliang. Meanwhile, Weiliang's wife can no longer conceal her suspicions and confronts him directly. Weiliang realizes that the police are onto him and goes on the run. The police launch a massive pursuit. SOD众人决定孤注一掷，私下调查。他们发现这一系列的案件都跟伟良有关。与此同时，伟良的妻子再也掩藏不住她的疑虑，直接与伟良摊牌。伟良发现警察查到他身上，展开逃亡。警方大肆展开追击。