When Minseok hears a girl singing when he passed the club rooms he was attracted to it, not knowing who the voice belongs to, he decided to ask his friend and sister if they knew who's it is, when they didn't know he decided not to overthink it, but in he also realizes he has feelings for his friends little sister who is a year younger than him, what would happen if that voice actually belonged to his friends little sister 

NAME : Kim Sungmi

AGE: 17 years old

Jongdae's little sister

NAME: Kim Minseok

AGE: 18 years old

Jongdae's best friend