The calculated distance (air line) between Gwangmyeong and Hwawŏn is approximately 147 miles respectively 237 kilometers.
By car or train, the actual journey to Hwawŏn is certainly longer, as only the direct route (as the crow flies) between Gwangmyeong and Hwawŏn has been calculated here.
Air line (approximately)
237 kilometers
128 nautical miles