Mystic School, Mint Rules. (Reader x Saeran)

(Y/N) is a young, happy girl going into high school. Her parents send her to boarding school with her cousin, Jumin Han. She arrives at Yeodale High and is put into a dormitory with a group called the "RFA" which her cousin Jumin is in. The leader, Rika, invites (Y/N) into the RFA, which (Y/N) accepts, but what she do...