https://www.army.mil/article/10874/yongsan_garrison_if_walls_could_talk

Before the U.S. military began using it in 1945 the Yongsan U.S. Garrison was used by the Japanese military.
I searched to see whether there was a street called '일제시대 비밀거리'. There was no information about this street. It may have existed during the Japanese colonial period, but I think it does not exist now.