Superintendent Lin Yazhi is a senior officer in the West Kowloon RCU. She is pragmatic and authoritative, initially reprimanding Inspector He for his aggression and attempting to discipline Guan Yingjun by assigning him the difficult Great Ferry Heist case, though she realizes it sounds more like a reward. She appreciates Jian Ruochen's natural talents—calm under pressure, de-escalation skills, sharp interrogation instincts, and handsome appearance—and offers to write him a recommendation letter upon his graduation. She is maternal towards Jian Ruochen, patting his head, and is pleased with how he defused inter-team conflict. She accepts coffee and pastries graciously, noting the diplomatic value of such gestures.
