The calculated distance (air line) between Panghyŏn-dong and Wŏnsan is approximately 128 miles respectively 206 kilometers.
By car or train, the actual journey to Wŏnsan is certainly longer, as only the direct route (as the crow flies) between Panghyŏn-dong and Wŏnsan has been calculated here.
Air line (approximately)
206 kilometers
111 nautical miles