The living room is a square space of 6.5m x 5.3m. If it divided into two, it will become two rectangular spaces which wastes the advantage of not having a structured wall. Therefore, the wall is removed, and the entire square space is presented by using the height from the flooring to the ceiling and glass elements. The stair has a unique treatment, only concise stair and low glass are made, and stair cabinets are not used. In addition, the position of the original window sill is used to create a stair with more changes in shape.