The calculated distance (air line) between Ungsang-nodongjagu and Hunchun is approximately 36 miles respectively 57 kilometers.
By car or train, the actual journey to Hunchun is certainly longer, as only the direct route (as the crow flies) between Ungsang-nodongjagu and Hunchun has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles