A male student who grapples with the claustrophobic environment and moral compromises. He gradually shifts from self-preservation to contributing to collective survival efforts.
Yu-jun observes Kyung-jun's suspicious movements, fueling distrust.
Yu-jun's observation implicates Jin-ha in suspicious activity.
Casual observation evolves into active suspicion as Kyung-jun's secretive movements raise red flags.
Both are classmates; Yu-jun's observations indirectly affect Yoon-seo's safety.
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