We made the entrance door using a folding door in the office of Seoul Investment & Securities Building. It is a place where you store necessary items in the office with the same space as the warehouse. If you install and use a regular open door, you often take up a lot of space unnecessarily because it does not fold when you open the door. Folding door is an advantage of folding, so it doesn't take up much space even if you open it, and you can open and close it neatly. Semi-automatic operation allows easy opening and closing without too much effort. In that sense, if you hold something in your hand, it can be more useful to open and close.

Construction is carried out in many places by connecting several folding doors, but one or two folding doors can be constructed like this construction site and used as entrance doors.