‘Corporate citizenship’ is an appropriate management model in a business environment where ESG issues are rapidly rising, as a company not only pursues economic profits, but also contributes to creating a better world by participating in solving social problems as a member of the social community. In order to respond to the business environment that demands more roles from companies and to acquire competitive strength, many companies are trying to learn the cases of the leading companies. This process of securing competitiveness through mutual organizational learning is called the Red Queen effect. The POSCO Group has been preemptively responding to ESG issues by declaring corporate citizenship as its management philosophy, giving it sufficient competitiveness as a leading company in consideration of the Red Queen effect. Accordingly, we intend to provide theoretical and practical implications for many companies that want to respond to ESG by analyzing the case of POSCO's corporate citizenship promotion and the mechanism that made it possible.