For the Chosun King to preside in Seoul, the king began building a castle in the year 1306 and completed the castle in 5 years. The circumstance of the castle was 17 km and was made towards the world. The areas it circled was Sung-Rae gate > So-ui gate > Don-ui gate > Chang-ui gate > Sook-jung gate >
Hye-hwa gate > Heung-in-ji gate > gwang-hi gate).