The calculated distance (air line) between Taesal-li and Cheongju-si is approximately 62 miles respectively 99 kilometers.
By car or train, the actual journey to Cheongju-si is certainly longer, as only the direct route (as the crow flies) between Taesal-li and Cheongju-si has been calculated here.
Air line (approximately)
99 kilometers
54 nautical miles