3 years ago, Jimin made it big. Minjeong didn't. Now Jimin's recording her solo debut - every lyric written by a stranger with a name she doesn't know. Except it's not a stranger. It's "Winter". And every word burns.

Winter just transferred to a new school, Karina and winter became best friends soon. Winter went through a lot of hard times, she manage to overcome through Karina. Winter is a straight girl but Karina is not. Karina love winter at first sight. But what about winter? What will happen to the both of them?

They argue like enemies. They look at each other like rivals. And no one suspects a thing. At the Haneul Faculty, Yu Jimin and Kim Minjeong are known for one thing only: tension. An academic rivalry so intense that everyone believes they can barely stand being in the same room. But there's a thing that nobody knows. Jimin and Minjeong are actually girlfriends. That means: Secretly dating. Enemies in public. Lovers in private. As jealous outsiders get too close, friends start asking the wrong questions, and emotions blur the line between pretending and truth, Jimin and Minjeong are forced to ask themselves how long a secret like theirs can survive in a world that's always watching. Because pretending to hate someone is easy. Pretending you don't love them? That's the hardest language of all.