The calculated distance (air line) between Yeonggwang and Pyeongtaek is approximately 123 miles respectively 198 kilometers.
By car or train, the actual journey to Pyeongtaek is certainly longer, as only the direct route (as the crow flies) between Yeonggwang and Pyeongtaek has been calculated here.
Air line (approximately)
198 kilometers
107 nautical miles