Song Hee (Kim Hyun Joo), who was left with only a Stradivarius violin after her parents' death, has a friend named Soo An (Park Yong Ha). Cherishing the promise to meet him again in 12 years, Song Hee becomes a kindergarten teacher and meets him as if in a dream. However, Soo An is engaged to Yoo Jung, Song Hee's elementary school classmate. Yoo Jung, a violinist, asks Song Hee to sell her the Stradivarius, but Song Hee refuses. Seeing Soo An and Yoo Jung together at a class reunion, Song Hee proposes giving the Stradivarius as an engagement gift and going on a 7-day date with Soo An...