duty after school 001

Kook Young Soo (selfish)

The most selfish character. He's obsessed with his studies and considers every minute outside of class a luxury. During the war, he thinks only of his own safety and will do anything to survive. His behavior causes conflict and ultimately leads to tragedy.

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Kim Deok-joon (military geek)

He loves food and adores military themes. His knowledge of games and stories often proves useful in war, although at first no one trusts his advice. He finds "almost a brother" in Sergeant Kim Won Bin.

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Wu Hee Rak (coward)

A true coward, he panics in any dangerous situation. His constant sense of guilt prevents him from completely abandoning his friends. His chaotic and immature reactions remind him that they are still children.

Young Bo Ra (the bully)

Bright, bold, and hot-tempered, she constantly bullies No Ae Sol. But behind this mask lies a person who is deathly afraid of losing her friends. She comes to the aid of those she teases, and Bo Ra's honesty makes No Ae Sol stronger.

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Kwon Il Ha (the bully)

The school's biggest bully is impulsive, cruel, and vengeful. But war redirects his aggressive energy: he becomes one of the school's best fighters, protecting his friends with his own life. He dies shielding Cha So-yeon.

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Cho Chang-soo (vice-prefect)

A natural-born leader with a mature mindset and a self-sacrificing spirit, he always looks out for the group and takes on the most dangerous missions. He volunteers to act as monster bait to save the others.

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Cho Young Shin (tactician)

A rational and cool-headed strategist, he quickly assesses the situation and always suggests the best solution—even if it's painful. For example, he suggests leaving the injured So-yeon behind to save the others. He takes on the role of "the bearer of bad news."

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No Ae Seol (outsider)

The quietest and weakest student, constantly bullied by Bo Ra. She's slow and often screws things up. But she has the best character development in the drama—from a "hopeless" girl, she transforms into a strong and independent woman. In the end, she's the one who stops the massacre perpetrated by Guk Yeon Soo.

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Wang Tae Man (class clown)

A carefree slacker who does nothing but sleep and fool around. But war forces him to mature: he becomes a reliable and loyal comrade, especially to the village chief, Kim Yu-jung.

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Cha So Yeon (in love)

A bright and carefree girl who falls in love with Commander Lee Chun-ho. Even in the apocalypse, she tries to maintain her teenage naivety. But after the commander's death, she darkens and loses her lightheartedness—the war takes away not only her lover, but also her childhood.

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Lee Chun-ho (platoon commander)

The platoon leader of Class 3-2. He's strict and meticulous, but cares for his students more than anyone else. Lee Chun-ho survived the first alien orb attack—his entire squad was wiped out, and he miraculously survived. This trauma has made him tough, but he does everything he can to prepare the children for war. He dies during the battle, which deeply affects Cha So-yeon, who was in love with him.

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Park Eun Young (class teacher)

A kind and caring teacher of class 3-2 who puts the safety of her students above all else. She always supports the children and tries to protect them from the brutality of war. When the first student is killed, she demands the commander send all the children home. She dies tragically during an alien attack.

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Kim Won Bin (Sergeant)

Lee Chun-ho's loyal assistant. He's 21 years old, but he looks much older, so the students constantly tease him. Despite his short temper, he's extremely dedicated to his work and cares deeply for the children. During battle, he covers for the students so they can evacuate safely.

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🧑‍🎓 STUDENTS OF CLASSES 3-2

Kim Chi Yeol (protagonist)

A quiet and withdrawn student, unnoticed in class. He had no dreams or goals in life. But during the war, he reveals an unexpected side—becoming a leader, saving his friends, and falling in love with Lee Na Ra. He remains kind and humane even in the hell of war, making him the central thread throughout the story.

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Lee Na Ra (sniper)

Quiet, cool, and incredibly accurate, she's the squad's best sniper. She's strong and independent, preferring to operate alone but gradually learning to work in a team. Her name translates as "butterfly," and she truly blossoms in war, becoming who she was always meant to be.

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Kim Yoo Jung (Chief)

At first glance, she appears timid and weak, but in reality, she's the "brains" of the group. She makes rational decisions even in the most difficult situations, assumes enormous responsibility, and never shows her fears.

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