The calculated distance (air line) between Jinan-gun and Gwangmyeong is approximately 121 miles respectively 194 kilometers.
By car or train, the actual journey to Gwangmyeong is certainly longer, as only the direct route (as the crow flies) between Jinan-gun and Gwangmyeong has been calculated here.
Air line (approximately)
194 kilometers
105 nautical miles