The modular system that combines unit unit modules to complete one building is an industrial construction method in which 70% of the units produced in the factory are transported to site and assembled to completion. It is a building developed in the United States and Europe, and is a building that combines and stacks individual modules using a box-type factory production module. In Japan, houses that apply various modular construction technologies make up 20% of the total housing market, and are currently being distributed in Korea.