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The pagoda visible in the back right is a modern structure it’s part of the Gyeongbokgung Palace Museum.
That area originally housed palace buildings belonging to Gyeongbokgung, but they were all destroyed by the Japanese during the colonial period. Today, reconstruction is difficult because there are no surviving pictures and paintings of what those buildings looked like. As a result, a small royal palace museum was built there instead

The issue is that Gyeongbokgung was the royal palace of the Joseon Dynasty, a kingdom that upheld Neo-Confucian ideals. Yet a Buddhist-style pagoda has been erected within the palace grounds. This has led to continued criticism, but since it functions as a museum, the government currently has no plans to remove it.