Duty After School — Characters & Cast

Survival and keeping his friends together.

Starts as an unassertive, average student who acts as the class observer/recorder. He grows into a resilient, emotionally grounded leader who survives the war but carries profound trauma.

Protecting his student-cadets at all costs.

Arrives as a cold, uncompromising drill commander. As he witnesses the students' pain, he becomes a devoted guardian who ultimately gives his life to eliminate a mass sphere threat and save Class 3-2.

Securing top CSAT scores and escaping poverty.

Begins as a socially awkward, study-obsessed nerd desperate for points. The trauma of war and his single-minded obsession warp his mind into paranoia, eventually driving him to murder his own classmates.

Protecting her peers through combat excellence.

A quiet, stoic girl who quickly discovers a genius aptitude for sniper marksmanship. She evolves from a detached teenager into the team's most reliable tactical protector and survives the massacre.

Masking insecurity with aggression, later seeking redemption.

Begins as Class 3-2's ruthless bully. Combat forces him to mature, forming genuine bonds and stepping up as a defender, only to be tragically murdered by Young-soo when discovering his unhinged secrets.