Yeoncheon County (Yeoncheon-gun) is a county in Gyeonggi Province, South Korea. The county seat is Yeoncheon-eup (연천읍) and sits on the Korail railroad line connecting Seoul, South Korea, with North Korea (DPRK). From Wikipedia
The Yongsan Police Precinct is examining her claim that she traveled to Seoul to see him after completing his military service