A bastion known as 'chi' was constructed to jut outward from a fortress wall, serving as a defensive position against approaching enemies. The name 'chi' originates from Chinese characters denoting 'pheasant' because of the pheasant's adeptness at hiding and peering. Hwaseong Fortress features ten bastions strategically positioned at regular intervals, approximately every 150 meters. Each bastion's configuration varies, adapting to the surrounding terrain.

Namchi, literally translated as the Southern Bastion, stands among these fortified structures. Positioned between Paldalmun (South Gate) and Namporu (Southern Sentry Post), Namchi was erected on a steep western slope, resulting in a shorter and narrower structure compared to other bastions situated on flat terrains. What sets Namchi apart is its inclusion of a small staircase leading inside. Remarkably, Namchi has maintained its original shape over time.