A poetic animated short film about lost belongings: There is an underground world, different from the world that ordinary people live in. Things that have been forgotten float down to this world, where Dong-Ja and two rabbits live. They are the first and the last beings to listen to the stories told by the forgotten items. One day, a strange glass bottle floats down to this world. There is a letter in the bottle, and Dong-Ja decides to return it to the owner.