Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
비상구계단은 건물의 안전을 위해 필수적입니다.bisanggu gyedan-eun geonmul-ui anjeon-eul wihae pil-su-jeog-imnida.The fire escape stairs are essential for the safety of the building.