Thunder was always shy around girls, and somewhat uncomfortable around them, it's not that he didn't like girls, he was just bad at telling them how he felt.

He only ever liked one girl, which she didn't feel the same way back, which caused him immense pain.

Until he met this new girl, which happens to be his sister's bandmate, Park Bom, how could he like an older woman? Is there something wrong with him? Or is this just some petty, lust crush? He couldn't tell, the only thing he could tell is that, Bom was way out of his league...