A story about the loved, the hated, and the unnoticed. Shin Daehee had a perfect life, and she never expected that everything would change in a matter of 30 days, the question is — what kind of change?

It was the shortest and yet the most memorable time of one painfully boring end of school year between a witty overly-confident perfectionist, a hot-headed egoistic arrogant, and a clever mischievous school delinquent.