When your best friend Youngmin tells you to meet him at the fountain at 11 on Christmas Eve, what could he possibly have in store for you?

Cho Hee is a girl with a dream to become a famous kpop singer and along her journey 4 members of boyfriend are going to help her. There will be love, hate, and fights

Park Min Hee is a 18 year old girl who was transfered to Korea to finish her studies. She is living with her mother's close friend and 6 other boys (BOYFRIEND)

Some people are envious of her job, being a personal assistant of six famous kpop artists collectively called BOYFRIEND, but for Luna, it's a punishment and living with them is hell. Donghyun is okay but keeps insisting that he doesn't need any help, making her feel useless. Hyunseong and Jeongmin are just trying to be nice but she doesn't know what really is going on in their minds. The Jo twins, Youngmin and Kwangmin are treating her like she's invisible. Oh, and did she mention their maknae, Minwoo? She just can't live a single minute with him without putting up an argument. Would they ever appreciate Luna's presence while she still have time to be with them? Would they treat her differently if they know her true identity and what she's going through? When she's in trouble, would anyone of them care to defend her and say "Don't touch my girl!"?