"I'm sorry, Miss Yi Ai, your song was not accepted, but your..." The slightly apologetic voice on the other end of the phone made her frown, and she hung up the phone. Three years ago she changed herself for a person, but in the end that person bid farewell to the world and turned into invisible gas. The newborn sunshine shone in the room, the wind gently blew the white curtains like elves singing and dancing, and the piano was filled with white memories, and she touched it. The unknown song came from the room. Memories slowly lengthen, flow backward, flow backward...