Kwon Jiyong is a university student majoring in Korean Classical Literature in Korea University. He is very bright for his age, has a light pink hair, a little naive, beautiful boy with feminine figure so he is often mistaken for girls, he loves sweets. Jiyong is clumsy and easly space out eventhough he's very clever. Jiyong has a little sister Chaerin. Jiyong expert in poetry studies and screenwriting.

Choi Seunghyun is a student of Korean Classical Literature same as Jiyong. Seunghyun doesn't really like to do anything that envolves effort, he always said "my time is precious, I'll kick your if you waste my precious time" with straight face. Seunghyun has a mint color hair, he is very handsome yet scary, he can be very annoying with his indifferent personality, but actually he's actually a good big brother figure, he's speciality in non-finction . Recently, his friends knew that Seunghyun actually manages to make a brilliantly logical thought. A little brother of Choi Dongwook.

Dong Yongbae is Jiyong childhood friend, same class with Jiyong and Seunghyun. A very mature person, well-mannered and intelligent boy. He takes particularly good care of Jiyong because Yongbae knew well that Jiyong 's very clumsy and too naive. He actually against Seunghyun for being so close to Jiyong because of his scary face (?) and indifferent personality. But later in the series, Yongbae gains some respect toward Seunghyun. Expert in Fiction literature.

Kang Daesung as known as Dumb and Dumber with Lee Seungri. He doesn't get good grades in class, he has an amazing energy and lovely smile. well, he always been seen smiling. Daesung will forget everything in his head when he overdoing things. Expert making people laugh.

Lee Seungri, the youngest, as known as Dumb and Dumber with Kang Daesung. Seungri is cheerful, he likes making jokes but rather sarcastic. He loves making prank to Jiyong, he is known to become easly jealous of Jiyong talent and face. Expert in fearless personality.

Choi Dongwook, a genius professor that always has ert thoughts. He is the older brother of Seunghyun, he force Seunghyun in the final project to gains some experiance with 'friends'.

Lee Chaerin, Jiyong stepsister. She often acts like older sister towars Jiyong, a highschool girl, she always curious about boy and boy love, she often asks Jiyong if he has crush with Seunghyun. Her first love is Youngbae. Has an obsession with horror movies and dark things.