Days approaching his sixtieth birthday, veteran Detective Kuo receives a new assignment involving the drug overdose and eventual death of a young girl. Departmental superiors see it as a textbook crime and urge him to conclude the case, but experience and sense tell Kuo otherwise. Thorough investigation leads him to a lively college girl, Lai Chun Chun, whose young and innocent appearance is shadowed by an indispensable grudge. Kuo's uncompromising principles and refusal to close the case turn him into an outcast, isolated from colleagues and family. And just when Kuo is on the verge of a breakthrough, his own dark past is unveiled by Wen, a young street vendor. Do Kuo's principles extend to his own misdeeds? Will justice prevail for the young addict? Kuo realizes he has one last chance to impose justice and find his own redemption.

刑警老郭在六十歲生日前，接手一件吸毒過量致死的案子，上級和同僚都想儘速結案，他卻堅持追查到底。明察暗訪後，涉案人指向外表開朗，內心卻滿懷怨恨的一位女大學生。老郭的固執，讓他和家人形同陌路，和工作搭檔反目。此刻一樁他隱藏多年的「罪行」，因為檳榔西施小雯的介入而浮出。向來以正義自居的老郭，這回能說清楚，講明白嗎？

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