Baek Sumin is a total tomboy. She chews with open, she burps and passes gas openly without a care. She never thought she needed to change until she develops a crush on one of her best friends...

Byun Baekhyun.

Byun Baekhyun, a player, a guy who has played with every girl's heart in Seoul High. A guy who's into the most girliest of girls.

What if Sumin tries to change for Baekhyun's sake?