Subway operators in South Korea are generating revenue by selling co-naming rights to corporations, allowing them to display their names alongside the original station names. Seoul Metro recently sold the co-naming rights for several stations, including Seongsu, Gangnam, Yeouinaru, and Sangbong stations, with prices ranging from 222 million won to 1.11 billion won. The buyers' names will be displayed throughout the stations and the entire metro system, and the contracts last for three years, with payments made annually. The initiative has attracted attention from various industries, with companies viewing co-naming rights as a form of effective outdoor advertising. However, the commercialization of subway station naming has sparked controversy, with concerns about private interests influencing public assets. To address these concerns, Seoul Metro has restricted participation in the bidding process to entities with business offices located within 1 kilometer of the designated station and without concerns about public morals, and is considering stricter standards for future programs to preserve public interest and regional identity.