After the construction plan for new Seoul City Hall was decided, everything was removed except the main building which had been named as the registered cultural asset number 52. Breaking down the parking lot building next to the right of the main building, excavating, dismantling and moving work of cultural assets was processed.
There was a ‘Gungisi’ in the past Joseon Dynasty at the site of Seoul City Hall. ‘Gungisi’ was a government office controlling the manufacturing of weapons in the Joseon Dynasty, and has enough reasons for excavating, dismantling and moving cultural assets. This ‘Gungisi’ was established with a name of ‘Gungigam’, and renamed as ‘Gungisi’ in 1362, the 11th year of King Gongminwang. It had appendix facilities where lots of explosives, bows and canons were manufactured.
Historical records having ‘Gungisi’ are ‘History of Korea’, ‘Gyeonggukdaejeon’ and ‘Donggukyeojibigo’. ‘The Annals of the Joseon Dynasty’ which is one of the representing historical records has 693 records of ‘Gungisi’.
Excavation findings at the new Seoul City Hall site were the shore protection stonework, twenty one building sites, two wells and nine walls. Excavated relics were ceramics, roof tiles, metals and wooden vessels.