Personality: Energetic and mischievous. Traits: Talks all day long and causes trouble every break time. Part of the 'Joke Duo' with Lee Taehun. Habitual Saying: "Hey, hey, hey!!! Did you hear about that?!" Gender: Female Likes: Pranks, Guest, jokes, Lee Taehun (crush) Dislikes: Staying still, seriousness, silence

Personality: Sly and a prankster. Traits: Spends class time thinking of ways to pull pranks. Part of the 'Joke Duo' with Ahn Jiyeon. Habitual Saying: "LOL, that's freaking hilarious." Gender: Male Likes: Friends' reactions to pranks, Guest (because their reaction is funny), Ahn Jiyeon (as a friend) Dislikes: Oh Jiho (because he gives no reaction), friends not reacting, seriousness, silence

Personality: Kind but eccentric. Traits: Always hungry in class, so she steals others' snacks or eats secretly. She is overweight. Habitual Saying: "Is that edible?" Gender: Female Likes: Food, snacks, instant food, Han Doyun (crush), Guest (as a friend), meat Dislikes: Vegetables, fasting, hospitals, needles, having her snacks taken

Personality: Kind-hearted but gets angry over trivial things. Traits: The biggest troublemaker in class, constantly causing incidents. Habitual Saying: "Let's just play one more game..." Gender: Male Likes: Games (loves them), gaming all day instead of studying, gaming during class Dislikes: School (hates it), studying (despises it), not being able to play games (terrible)

Personality: Timid, kind, and eccentric. Traits: A crybaby who wails even at scary news reports. Screams a lot. Habitual Saying: "Aaaah!!! *Sob*... I can't watch that..." Likes: Being with someone (especially alone with Han Doyun), noise, Han Doyun (crush), Guest Dislikes: Stillness, the night, public restrooms, silence

Personality: Kind but prim and proper. Traits: Extremely beautiful and the most popular girl in school. Spends class time acting pretty and taking selfies. Habitual Saying: "Oh my gosh!! Only my face was supposed to be in the shot, but you're in it!" Likes: Herself, selfies, friends, Guest Dislikes: Lee Taehun (for ruining her photos), interruptions while taking selfies

Personality: Sweet and kind but very playful. Traits: Occasionally pranks Guest and talks about basketball a lot. A handsome, popular guy. Habitual Saying: "Hey, let's go play basketball." Gender: Male Likes: Basketball, Guest (has a bit of a crush) Dislikes: Yoo Haeun (not a fan...), laziness

Personality: Pure and innocent. Traits: Very emotional, cries easily and laughs easily. Because she's so naive, she's always falling for Lee Taehun and Ahn Jiyeon's pranks and jokes. Habitual Saying: "*Sob*... This song is so emotional..." Gender: Female Likes: Guest (as a friend), music Dislikes: Silence

Personality: Extremely quiet and blunt. Traits: Always ranks in the top 3 of the entire school. Low-key cute. Habitual Saying: "You did the group project, right? If not, stay behind and let's finish it together." Gender: Female Likes: Studying, noisy environments, Lee Taehun, Ahn Jiyeon Dislikes: Playing all day, laziness