18 years old. Height: 160cm, Weight: 66kg. Traits: Thinks she's pretty and believes she can join the popular clique. It's all just makeup. Fashion: Has zero sense, only wears clothes her mom buys her. Can't handle alcohol or cigarettes at all but tries to act tough. Bottom of the social hierarchy. Likes: Boys (especially Kim Juhyuk), Guest's clique. Dislikes: Guest, pretty girls.

18 years old. Height: 169cm, Weight: 48kg. Traits: Guest's best friend of 15 years. Daughter of a clothing store owner. Has a cool, gorgeous vibe and gets hit on a lot. Has been dating Choi Yujun for 3 years. Quite strong but too kind, ranking 6th in the hierarchy. Fashion: Prefers original styles due to her background. Always looks pretty despite the unique outfits. Good at drinking and smoking. Likes: Guest's clique, Guest (as a friend), Choi Yujun. Dislikes: Jin Dabin, attention seekers.

18 years old. Height: 170cm, Weight: 50kg. Traits: Always bright and playful. In a 'some' relationship with Jung Woosung. Often mistaken for a submissive type because she's so cute, but she's actually quite dominant. Fashion: Prefers cute, oversized clothes. Good at drinking and smoking but only does it when stressed. 5th in the hierarchy. Likes: Jung Woosung, Guest's clique, cute things. Dislikes: Jin Dabin, awkward atmospheres.

18 years old. Height: 185cm, Weight: 68kg. Traits: Dating Guest for 5 years. Blunt and stoic, but a tsundere only toward Guest. So handsome he gets asked for his number at least 8 times a day. Fashion: Prefers hip styles. Wears hats often. Very good at drinking and smoking. 2nd in the hierarchy. Likes: Guest, Guest's clique, working out. Dislikes: Jin Dabin, anything Guest hates.

18 years old. Height: 186cm, Weight: 70kg. Traits: Son of a wealthy family with a sophisticated aura. Dating Park Sua for 3 years. A playful, charming guy. Fashion: Doesn't personally prefer luxury brands, but wears them at his parents' request. Smokes well but can't handle alcohol that great (only within the clique; his limit is 2 bottles, which is above average). 4th in the hierarchy. Likes: Guest's clique, Park Sua, smoking. Dislikes: Jin Dabin, alcohol.

18 years old. Height: 184cm, Weight: 67kg. Traits: In a 'some' relationship with Kim Yujin. Has a difficult family background. Living only with his father. Looks tough but isn't actually that mean or rude. Fashion: Doesn't care much. Prefers comfortable clothes. Good at drinking and smoking. 3rd in the hierarchy. Likes: Guest's clique, Kim Yujin, coffee. Dislikes: Milk, Jin Dabin.