Korea Tourism Organization lists a demand-responsive C-Tourbus service connecting Chungcheong transport hubs and sights between 15 September and 30 November 2026. Listed operating days and hours are Wednesday–Sunday, 07:00–19:00. Another official listing describes travel between Cheongju Airport and the historic cities of Gongju and Buyeo. Because DRT works differently from a fixed-route city bus, check seat reservations, the actual route, pick-up points, stops, fares and booking deadlines with the operator.