This couch was made by the same pattern and principle as the beige couches in the living room. The basic structure of it is just cardboard, and it's extremely easy to make.
I started by cutting out squares that would make the different parts of the couch. Each part is made up of three layers of cardboard, so each part of your couch needs to be cut out three times. You glue them together like on the picture and glue fiberfill on top of the pieces that are on the inside of the couch.