your crush, Kyunwoo made a promise to you before you flew away to US. he made a promise that if you come back, he'll hug you tightly and kiss you, and that he'll also treat you to a fancy restaurant. You missed him so much in US. but somehow, you couldn't manage to contact him. You were busy with school in the US. 3 years later, you went back to your own hometown. You didn't wait at the airport, but went to the park you and Kyunwoo usually go to.. you saw him, but.. with another girl.