IS DongSeo Co., Ltd. engages in the construction and construction materials businesses in South Korea. The company constructs apartments, villas, schools, museums, leisure facilities, residential-commercial complexes, roads, bridges, tunnels, railroads, ports, golf clubs, and resorts. It also provides various concrete products, including PHC piles, concrete segments, general PC products, rail ties for the railroads, and construction PC materials. The company was founded in 1975 and is headquartered in Seoul, South Korea.