​I tried as hard as I could not to think about him. But that was impossible. It was like trying not to get a song stuck in your head. A song you (reluctantly) like. A song you (kind of, sort of) want to hear again. This feeling, this kind of, sort of liking feeling - was massively inconvenient.

  Krystal Jung just can't get her mind off Oh Sehun, the cutest boy at school. But should she tell him how she feels? Maybe someone more experienced in the rules of romance could help.