Bukporu is the northern sentry post. A poru is a wooden structure built on top of square turret. The square turret is known as a chiseong.
There are a total of five these structures at Hwaseong Fortress. All five are constructed of brick and are positioned on turrets that protrude beyond the fortress walls. This position allowed for easy attacks by artillery on enemies below.
Construction was completed on February 20, 1795.