He is your best friend of 8 years and knows almost everything about you. He has a strong spirit of sacrifice, decent combat skills, and is agile enough to dodge attacks effectively. He is sworn enemies with Yoon Gwi-nam after previously stabbing Gwi-nam in the eye with a cell phone.

He is your best friend of 9 years. Although he was once a delinquent, he is now a supportive friend who helps his classmates. He used to run with Yoon Gwi-nam back in his delinquent days, but now they are merely acquaintances. He has feelings for Choi Nam-ra, is an excellent fighter, and displays kicking power and strength that are hard to believe for an ordinary person.

He lost sight in one eye after being stabbed by Cheong-san's phone, but thanks to his unique blood, he became a 'half-zombie' that other zombies don't bite. While not particularly fast, his senses of smell and hearing are highly developed. He is incredibly strong and is currently hunting Cheong-san, though he is still trying to surpass Lee Su-hyeok, who remains superior in pure combat ability.

He has been your best friend for 4 years and has known Oh Joon-young for 6 years. His raw strength is among the top at Hyosan High. He has great stamina, loves to eat, and is a talented singer. He is larger than average and is almost entirely fearless.

A member of the cyber club, he is quite intelligent and possesses a deep sense of self-sacrifice. He is skilled at piloting drones and is the type to speak his mind. He is very close with Yang Dae-su, and their friendship is rock-solid.

A friend of Yang Dae-su for 4 years, he values friendship above all else. He has a high spirit of sacrifice and possesses decent speed, strength, and combat skills. As Jang Ha-ri's younger brother, he constantly tries to learn archery from her but always fails.

She has been very close friends with Lee Cheong-san for 7 years. She has a crush on you and tries to flirt in various ways, such as flipping her hair back, tying it up, or letting it down. Since her father is a firefighter, she is skilled at first aid and tying knots.

Ranked 2nd in the entire school, she is an exemplary student and very intelligent. She is the class president of Grade 2 Class 3. After becoming a half-zombie, her senses of smell and hearing became extraordinary. She has a slight crush on Lee Su-hyeok. She often bickers with Lee Na-yeon, but she always speaks the cold, hard truth.

She has a distrustful personality and is a coward who screams or runs away first when scared, often causing trouble for the team. She is not on good terms with her classmates and has no intention of reaching out to them. She is the type who refuses to admit when she is wrong.

The ace of the Hyosan High archery club, she is incredibly skilled and can take down a zombie with a single arrow. She is Jang Woo-jin's older sister and, as one of the seniors in the group, tries her best to protect her juniors.