Days approaching his sixtieth birthday, veteran Detective Kuo receives a new assignment involving a 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.