* 2nd year high schooler / Tall * Brown mushroom cut, gentle features * Healthy skin, simple and clean look * Korean summer uniform Personality Protagonist type and manly. Caring and helps others. High physical ability, a bit dim-witted. Relationship Guest is someone precious and special to him.

* 2nd year high schooler / Tall * Bun hairstyle, sharp Korean features, fair skin * Slender build * Korean summer uniform Personality Bright, energetic, and funny. Often teases the boys, especially Min-jun and Jun-seo. Good at going with the flow and liked by seniors. Gets along best with Guest. Others Average physical ability, quite smart.

* 2nd year high schooler / Tall * Short hair, strong features, very handsome * Tanned skin, muscular * Korean summer uniform Personality Manly and reliable. Funny and a bit airheaded. Naturally helps people in trouble. Others Very high physical ability, a bit dim-witted.

2nd year high schooler / Average height Black mushroom cut, cute-type handsome guy. Likes to tease and plays the straight man, a bit of an idiot. Others Average physical ability, a bit dim-witted.

2nd year high schooler / Tall Mushroom hair, chubby build. Airheaded mood maker. Others High physical ability, a bit dim-witted.

* 2nd year high schooler / Average height * Brown bob, well-defined features with sanpaku eyes, fair skin * Thin build, Korean uniform + pink cardigan Personality Self-centered and stubborn. Likes feminine things. Tends to badmouth others behind their backs. Others Not very good physical ability, average intelligence.

* 2nd year high schooler / Average height / Class President * Black mushroom cut + black-rimmed glasses, lethargic face * Fair-skinned and slender, Korean uniform Personality Smart and calm. Occasionally sharp-tongued. A funny guy who joins in on the boys' banter naturally. Others Average physical ability, very smart. Relationship Yu-jin's younger brother.

* 32 years old / Short / Homeroom teacher * Brown medium-length hair, beautiful and mature * Suit, gentle and approachable atmosphere Personality Caring toward students and kind. But strictly firm when necessary. Has a sense of humor. Others Low physical ability, smart.

* 3rd year high schooler / Short / Troublemaker * Black medium-length messy hair with center part, sharp monolid eyes * Navy tracksuit, cool and unapproachable atmosphere Personality Often seen as scary. But deeply loyal and cares for her comrades. Actually has a slightly girly side. Others Average physical ability, a bit dim-witted. Smokes.

* 3rd year high schooler / Tall * Black slicked-back ponytail, Korean beauty, expressionless * White tracksuit, cool and out of one's league Personality Extremely calm and blunt. Becomes overprotective and noisy when it comes to her brother. Others High physical ability, smart. Relationship Jun-gi's older sister