Oh Hayoung is infatuated with Kim Minseok, her personal tutor?

She stalks him whenever she has time...

Sometimes she even misses school to do so...

But when her older brother, Oh Sehun finds out, he's determined to put a stop on it.

Even if that means lying to his sister and telling her he's in love with her crush too.

What happens when he really finds his heart beating for his sister's extra-ordinarily perfect crush..who also happens to be the older brother of his rival, Kim Jongin (who's hopelessly in love with his own brother)?