That is Gyeongbokgung.
In Gyeongbokgung,we can see Sajeongjeo, Jagyeongjeon and many more. Jagyeongjeon is the king's house and Sajeongjeo is the queen's house. Also we can see a Geunjeongjeon and Gyeonghoeru. Geunjeongjeon is a hall with vassal and Gyeonghoeru is arranged for foreign court officials.
Gyeongbokgung is the main palace of Joseon.
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