Namhansanseong Haenggung is a royal villa inside Namhansanseong where King Injo stayed, located near the parking lot and bus stop. Visitors can look through the interior of the haenggung and then continue walking along the fortress wall path. Injo resisted here during the Byeongja Horan, and the site was destroyed by the Eulchuknyeon Great Flood, then excavated and restored. The current building is a reconstruction rebuilt in 2010.