Coo! I see Hangul script on the signs, which confirms I am in South Korea. There is a sign for "Dongja Children's Park" (동자어린이공원). The tall, modern skyscraper in the background is a strong landmark. This looks like a dense urban neighborhood in Seoul, likely near Seoul Station given the "Dongja" name. I am quite confident this is in the Yongsan District.

then: guess