The piano song itself doesn't have a story but was adapted by netizens to the tune of the piano song as "The Song of the Bean Blossom" This song was written by a fan for Jung Yunho and Kim Jaejoong, whose CP name is Bean Blossom, and the song of the bean blossom was sung by a fan for the two of them. The original song borrowed is THE TRUTH THAT YOU LEAVE, and both the words and the singer are fans.