It is a world where high buildings fill the sky and things get thrown away as soon as they become useless. A dog named Mogeulee got abandoned when he was a puppy because he couldn’t prove he was useful. Mogeulee wanders about from place to place, and he ends up in a dumpsite. Hurt by people, Mugeulee is hostile to everyone he meets, but he opens up to a robot named ‘Rom’ he met in the dumpsite. After finding out that Rom wishes to go back to its home, Mogeulee goes through hardships and troubles with Rom to find the way to Rom’s home.