Seojangdae served as a location for generals to oversee their soldiers, providing a vantage point both inside and outside of Hwaseong Fortress. The term "Seo" in Seojangdae signifies west, as it was positioned on the western side of the fortress. In 1795, King Jungjo personally trained his soldiers at this site. The painting capturing this moment is referred to as the 'Seojangdaesungjodo,' constituting one part of the Palpokbyungpungs.

This two-story building, Seojangdae, contains an interior staircase. The lower floor consists of three rooms arranged vertically and horizontally, with the central room designated for the use of generals. Standing at Seojangdae evokes the spirit and legacy of the esteemed generals of old.

Suwon Hwaseong features two balconies, Seonodae and Dongbuknodae, elevated positions from which catapults were employed against enemy attacks. Additionally, Hwaseong Balcony served for monitoring enemy movements and transmitting signals, using five-color flags and other means, to a command post and throughout the entire castle.

From Seonodae, when observing the surroundings, a vast water pool becomes apparent in the front. Originally a reservoir, this water source was utilized for agricultural purposes. During the construction of the fortress, King Jungjo excavated four reservoirs to support farming, as it was essential for attracting settlers to the fortress. King Jungjo's concern for both the construction of the fortress and the livelihoods of the people is evident. Presently, only two of the reservoirs, constructed by the king in the west and north, remain.