
According to KTO, the Hwaseong Fortress was constructed under the guidance of Yu Hyeong-Won (1622-1673) and Jeong Yak-Yong (1762-1836), and is believed to have been constructed very scientifically. The fortress wall was built using Seokjae and Jeondol (bricks) and the holes between the bricks are just big enough to fire guns, arrows, or long spears through in case of an attack.