It's time for the fair at Woolim High, and they've planned a special event this year. A night with the school's baby-faced prince, Sungyeol. 

Myungsoo (Will be referred to as L): The school's jock, in an open relationship with Sungyeol. A past playboy, with flirty habits he still needs to get rid of. In Class 3A, a class full of mischiveous kids. 

Sungyeol: The school's baby-faced prince. In an open relationship with L. He's a bubbly little choding, with a shy side that he rarely shows. In Class 3A, along with his boyfriend.

Sungjong: The mastermind behind the special event at the fair this year. He's a diva with an attitude. 

Sunggyu: Class 3A's president. Probably the only student against the special event idea. He's best friends with Sungyeol, and is closely tailed by Woohyun, another one of the jocks.

Woohyun: In Class 3B, Class 3A's rival class. He's known as the biggest flirt in school, but he isn't a playboy. Unlike his image, Woohyun only has his eyes on one boy.

Dongwoo: In Class 3B. In an open relationship with Hoya. He's got one of his own special events planned for his class.

Hoya: In Class 3B. He's another one of the jocks, but the most timid of them all. He's got his boyfriend, and so he doesn't flirt with anyone. Class 3B's president.