The calculated distance (air line) between Yeonggwang and Gwangmyeong is approximately 153 miles respectively 247 kilometers.
By car or train, the actual journey to Gwangmyeong is certainly longer, as only the direct route (as the crow flies) between Yeonggwang and Gwangmyeong has been calculated here.
Air line (approximately)
247 kilometers
133 nautical miles