The film follows the weak-willed Zhang Shi-hao, who becomes jealous when a new transfer student called Lin Yu-en flirts with his girlfriend. Although Zhang is too meek to take revenge, his best friend A-Yang sets up a brutal attack on Lin with a group of other boys. The timid Zhang joins in, releasing his pent up anger and frustration, feeling a sense of satisfaction afterwards, which turns to shock and guilt when Lin collapses and dies during a PE lesson the next day. Blaming himself, the tormented Zhang decides to confess, though fate has something else in store for him. Through Zhang’s personal journey, the film examines the process of redemption, asking the question whether guilt can be a positive force, pushing us to rise above our shortcomings.