As the largest city gas supply company in Korea, Samchully has shown consistently a profit on revenue growth and a profitable business since its establishment 52 years. Beginning in the 1960s, under government-led economic development policy and public, Samchully had grown as a top company in the coal industry around the founder’s entrepreneurship through a procurement of raw materials, technology development, and productivity innovation in 20 years after foundation. Since the '80s the external environment changes had been begun with the government’s eco-friendly energy policy, including changes in consumer preferences, and Samchully converted briquettes business into gas. Even though Samchully entered as a newcomer to the city gas industry, Samchully has become a leading company in that industry through strategies such as a successful M&A, expansion of supply domain, aggressive investment in pipelines installation and technology, and pioneered industrial demand. In addition, Samchully’s corporate culture and business philosophy also has been very competitive. However, because of the increased uncertainty in the business environment, Samchully is being requested another challenge and change for the sustainable growth. Samchully has pushed strongly to diversify the business to have a dynamic force for new growth standing on baisis the core competencies of the energy industry with .the vision “from the energy to the environment, Samchully which creates the future”.