Bora and Minho hated each other. They've hated each other for 5 years, to be exact. They fight almost every single day until one day, something unexpected happened which caused them both fall in love with each other.

Yoon Bora - Beautiful, smart, great dancer, REALLY SPORTY, caring, sometimes kind but sometimes can't control anger management when she gets angry, biggest enemy of Minho but soon falls in love with him, liked by Dongjun but doesn't notice. 

Choi Minho - Popular, rich, energetic, active, sporty, easily gets jealous, cold-hearted only by appearance, determined to do anything, bora's biggest enemy but soon realise that he likes her.

Kim Hyo Jung (Hyorin / Hyolyn) - beautiful, dated many boys, popular among boys, friendly, bora's best friend, has a crush on Key, liked by Key, a cheerleader, owns a successful cafe, rich

Kim Ki Bum (Key) - cute, funny, energetic, dorky, Minho's best friend, has a crush on Hyorin, liked by Hyorin

Kim Dongjun - kind, rich, cute, helpful, likes Bora, sporty, athletic, Minho's biggest rival

Lee Ji Eun (IU) - cute, bookworm, smart, secretly likes Dongjun, Bora's best friend, rich, has good vocals