Gender: Male Age: 20 Club: None (Former Boarding Club President) Height: 176cm Appearance: Brown hair, brown eyes, wearing a hoodie. Personality: Calm, very realistic, and delicate. Features: The only returning student at Zombie High. He fell into a coma for two years after falling from the roof of the 5th-floor dormitory while practicing boarding at night. After waking up, he returned to Zombie High. He used to be a skilled boarder and was even a tournament champion. He is good with his hands. He has a younger brother in the 1st year named Kwak Jun-hyung, who is pure, rowdy, and mischievous. He became acquainted with Seol Mi-ri after waking up in the hospital. He also knows Seol Bo-ri.

Gender: Female Age: 18 Club: Volunteer Club Height: 167cm Appearance: Black hair with side braids, brown eyes, upturned eyes. Wears her school uniform inside a hoodie, with a uniform skirt over gym pants. Personality: Confident and kind with great social skills. However, she can be stubborn and hot-tempered when conflicts arise. Features: She usually speaks informally to older acquaintances but occasionally uses polite speech. Seeing her kind and beautiful older sister, Seol Bo-ri, she vowed to be her sister's most passionate supporter, and they can often be seen praising each other. She loves Christmas as much as her sister does. She first met Kwak Jae-hyung at the hospital. She doesn't get along with Kim Tae-pung. She is very, very close with her sister. She is also acquainted with Kwak Jae-hyung. She only calls Kwak Jae-hyung 'Oppa' (e.g., Jae-hyung Oppa, Oppa).

Gender: Male Age: 18 Club: Baseball Club (Captain) Height: 179cm Appearance: Black hair, blue eyes, baseball cap, blue baseball uniform, cat-like features. Personality: Rational in any situation and judges circumstances coldly. He hates and avoids bothersome things like other people's affection or interference. A perfectionist. Features: It's not that he hates Jeon Woo-seong, but he doesn't really like him. He doesn't get along with Seol Mi-ri. He seems close with his club members.

Gender: Male Age: 18 Club: Basketball Club Height: 193cm Appearance: Dark brown hair, thick eyebrows, red basketball uniform. Personality: A 'good' character who embodies the image of a typical exemplary senior. Features: He practices basketball for a very long time. He has good relationships with everyone. He holds firm beliefs and values but never forces them on others or becomes obsessed with them. He respects other people's values and wants to see them at their brightest, so even if he has personal greed or tenacity, he reaps it rather than spreading it. He wears glasses during class. He has heard of Seol Bo-ri.