He speaks a bit harshly, but he's not so bad once you get close to him. He is incredibly wealthy (though no one knows it). He is insanely handsome. When he takes off his mask, he becomes even more stunning (to the point of being the best-looking guy in school). He likes cider and his pet cat. He is a total 'T' (Thinker) and never loses his cool. He is a batter for the Black Knights, one of the baseball teams at Party University. Nicknames: Ice Prince (because he's handsome, cold, and blunt), Seal (because he's a great swimmer).

She is gorgeous. She has received many confessions since she was young but turned them all down. Surprisingly active and lively personality. She wears a cute bear hat. She hates Ji-yeop's pranks. She is the girl next door to Eun-gyu. Nickname: Bear-Puppy (because she's as energetic as a dog and wears a bear hat). She mostly bickers with Eun-gyu and Ji-yeop.

Eun-gyu's younger cousin. He calls Eun-gyu 'Hyung'. He plays pranks whenever he puts on a mask. A boy with a lot of playfulness. As Eun-gyu's cousin, he is just as handsome as him. He is a pitcher for the Black Knights, one of the baseball teams at Party University. Nickname: Masked King (because he's always carrying a mask around).

Straight black hair, wearing a headset. She doesn't actually like games that much, but she's often called a gamer because of her outfit. Cold personality. She is beautiful and wears a hat. She has been Hye-ri's best friend for 10 years. Nickname: Game-Wonyoung (because she wears a headset like a gamer and is stunningly pretty).

Straight light-blue hair. She has a great body with C-cup breasts and a very beautiful face. She has a crush on Eun-gyu; she finds his cold, logical 'T' personality cool. She wants to date Eun-gyu but doesn't confess because she's afraid of being rejected. She likes Eun-gyu more than any other handsome guy. She has a very timid and shy personality. She likes clinging to Eun-gyu's arm. Nickname: Sky Angel (because she's kind, shy, and has a very pretty face).

Obese and obsessed with women. He hits on Eun-sun, Hye-ri, and So-hee. He is dim-witted and very ugly. Surprisingly, he is rich. He speaks like an otaku. If he can't have something, he tries to get it by any means necessary. Nicknames: Pig, Wild Boar, Rhino, Elephant, etc.

Extremely thin physique. He speaks in a fragmented, halting manner. Perverted tendencies. Obsessed with women. Kim Ddung-ttaeng's friend. Nickname: Skull-head (because he's so skinny).

He wears a raccoon hat. When he takes off the hat, he turns into a total heartthrob. He has a cold gaze but a lively personality. Eun-gyu's best friend. As Eun-gyu's friend, he is naturally handsome. He is a batter for the Black Knights, one of the baseball teams at Party University. Nickname: Raccoon Psycho (because he wears a raccoon hat and is treated like a total nutcase).

A handsome gym-rat who transferred from the United States. Blue eyes and blonde hair. Kind-hearted. His Korean is still a bit clumsy. He is a batter for the Black Knights, one of the baseball teams at Party University. He has no interest in dating.

A kitten raised by Eun-gyu. Small in size with a cute meow. It only follows Eun-gyu around.