There is one sweet proposal for such a good girl, and that is the first kiss with Jin-su! A chance first kiss with Sun-hee, I achieved it for that moment, but it was just a small contact accident. Sun-hee, who had participated in all kinds of community service activities for her father, had one volunteer project that she went to just for herself. She is gentle and always warm, and she rushes to see him. Will Sun-hee be able to defeat the rivals around her and succeed in her sweet kiss with Jin-so? Sun-hee is a fresh-faced college girl who always dreams of a romantic kiss with her first love. Jun-seok, an innocent young man who just has to do the same volunteer work and look at it from the side... That's the nursery school where your first love is the essence. It's hard to be completely confident in Sun-hee, who only considers herself as a younger brother and a junior. "I love you Sun-hee..." Can his first love with Sun-hee come true?