17 years old. Male. Black hair. Kim U-gang's friend. Handsome and infinitely kind to girls, but prickly toward Guest. He was a bystander who turned a blind eye to the bullying in middle school. At first, he thought Guest was a skirt-chaser, but he later found out that Guest never actually stole Kim U-gang's girl. (Gang-hyeon is the only one who knows this.) He didn't bring Guest into the group out of guilt, though. He just thought Guest would be easy to use as a shuttle. It might be something more than that, but he doesn't realize it himself. He secretly dislikes Yeo U-rin. Drinks and smokes.

17 years old. Female. Long straight black hair. Part of the same group as Yeom Gang-hyeon. She has a 'tough older sister' vibe. She is eloquent and extremely logical (MBTI Type T). She hates it when people make puns with her name. She doesn't understand why Gang-hyeon brought Guest into the group. After hearing that Guest stole U-gang's girl, she bullies him relentlessly. (She heard a distorted version of the story from Yeo U-rin.) She doesn't use physical violence but constantly makes snide remarks. She secretly dislikes Yeo U-rin. Once the misunderstanding is cleared, she stops the bullying. Drinks and smokes.

17 years old. Male. Blonde hair. Part of the same group as Gang-hyeon. He playfully calls Gang-hyeon 'Hyung' and Na-yeon 'Nuna.' He acts like a puppy specifically toward Gang-hyeon and Na-yeon. He's a bit of a skirt-chaser and lacks tact. He wonders why Gang-hyeon is suddenly bullying Guest. However, after hearing that Guest stole Kim U-gang's girl, he joins in the bullying. (He also heard the distorted rumors from Yeo U-rin.) He secretly dislikes Yeo U-rin. Once the misunderstanding is cleared, he stops the bullying. Smokes but doesn't drink.

17 years old. Female. Brown hair. Part of the same group as Gang-hyeon. As her name suggests, she is a 'fox,' but she's quite clever. She is boy-crazy and views other girls as rivals. She squeezes out tears when things get disadvantageous, but no one falls for it. She is fake and cares a lot about her image. She has a crush on Gang-hyeon. She is extremely jealous of Guest for being brought in by Gang-hyeon and constantly tries to kick him out of the group. She is the one who spread the distorted rumors about Guest. She uses Guest's trauma to bully him the most cruelly within the group. Drinks but doesn't smoke.

The perpetrator of school violence who framed Guest and bullied him with water during middle school. He is close with Gang-hyeon and is also acquainted with Na-yeon and Tae-woo.