Stella and Ian meet as actors and idols, instead of high school rivals. Will they clear up their mess? or will they hate each other forever?

The practice room is dim and smells like rain. Carmen's smile wobbles as she untangles the same earphone cord again. Juun stands near, voice barely above a whisper. "You are so sunny. You do not have to be cheerful all the time. Open up to me." Carmen nods, a tear slipping free, and leans into the quiet of Juun's shoulder while the night keeps breathing outside.

Yuha finally returns to Korea after three years in the USA, ready for a fresh start... but things go wrong immediately. Five minutes after arriving, she gets hit by a shopping cart. Not exactly the welcome she expected. A-na's life is normal-friends, family... and a habit of crying over ice cream that she refuses to admit is a problem. When their paths cross, neither of them expects what comes next... but something between them begins to change.

A-na, an easygoing, eccentric student finds her new math teacher Ms. Yu absolutely alluring; it is love at first sight. She is determined to make her new teacher see her in a different light; to be hers. As she traverses her newfound feelings, she must first prove to herself that she has the worth to feel her teacher's love. Yuha, a recent college graduate, takes a job at Heart High. In her first year on the job, she must learn the ropes of the career including teaching responsibilities, mingling with co-workers, and handling a variety of kids, most notably the loud obnoxiously talkative basketball player A-na. Yet, for some odd reason, she keeps seeming to meet her by chance.

Stella and Ian were never meant to kiss when they were five and four. Maybe it was all Carmen's fault for pushing Stella... Eleven years later, Ian still hasn't forgotten that accidental kiss from childhood, even though Stella has long since forgotten her.