Remodeling of the Dondaemun Library. -DOUBLE SKIN FACADE WITH SHADING PLATE The sunshade and outdoor terrace were expanded to control the sun's rays, taking into account that the front of the building is facing west. The expanded terraces connect with existing parks and help prevent heat energy through recording. In addition, the curtain wall was installed large to break down the face of the existing blocked building, secure visibility, and establish the elevation of the building. The main double skin facade of the project consists of the first glass of the newly designed window frame, the shield panel, and the second glass. In it, the sun visors rotate and control the sun.