The loosely structured plot involves Hsiao-kang, a despondent cram school student, who becomes obsessed with young petty thief Ah-tze, after Ah-tze smashes the rearview mirror of a taxi driven by Hsiao-kang's father. Hsiao-kang stalks Ah-tze and his buddy Ah-ping as they hang out in the film's iconic arcade (featuring a telling poster of James Dean on the wall) and other locales around Taipei, and ultimately takes his revenge.