Wonjin group made the foundation of the business starting from Wangpyo Briquette Co., Ltd. and gradually grew through the diversification of the businesses including refractories material, city gas, coal mine, construction, and boilers, etc. In 1990, Wangpyo Co., Ltd. changed the name to Wonjin Co., Ltd., starting Wonjin group to make a better leap, and for the growth through specialization of each business, Wonjin Co., Ltd. divided the company in 2002, and succeeding the company ideology of Wangpyo Briquette.