Found on the home page of the Seoul Zoo website:
“The first zoo in Korea was built in 1909 at the former royal palace of Changgyeongung, which was renamed Changgyeongweon under imperialist Japan in an effort to eradicate the national spirit of and insult Koreans. The zoo, which had been maintained at Changgyeongweon following after Korea’s independence, was relocated to the current site in Makgyedong, Gwacheon in 1984 and began its new history as Seoul Zoo. Now more than twenty years have passed since its relocation, and Seoul Zoo has grown to the tenth largest zoo in the world.”