Eun Dana, a girl who grew up on an island, loses the bucket list she wrote in anticipation of her very first school life.
The one who finds the notebook is Cheon Sehwa, a somewhat mysterious boy from her class.

Dana approaches Sehwa and openly shows her interest in him, but Sehwa feels overwhelmed by her attention.
The more time he spends with her, the more his cheeks redden and his chest tightens with an unfamiliar, uncomfortable feeling.
And yet… somehow, he doesn’t dislike it.