Siyeon, 18 years old, has recently moved into a new school after getting in some troubles in her last one. There, she meets some people who become her friends, but one of them stands out: Gahyeon.
Gahyeon, 15 years old, is a smart girl, being the number one student, but she's hiding a dark secret.
She has a lot of friends, but another girl joins them during the middle of the year.
What's Gahyeon secret, will Siyeon be able to help her, and most importantly, what are those weird dreams they're having?!