Lee Song Hi was raised by her father, who is a violinist. After her father's death, she falls in love with her elementary school friend Su An. After 12 years, Song Hi, who is a teacher at kindergarten, meets Su An again. The love of Song Hi was not changed, but Su An became a different person. He becomes a lawyer and has fiancee Yu Jeong, violinist. Song Hi promises to give her father's Stradivarius violin to Su An if he forgets that he is about to be married and dates her for one week.