This school appears as the elite Shinha High School which all the Sky Castle neighborhood kids attend in SKY Castle (SKY 캐슬) (JTBC, 2018-19) — as seen in episode 7 and 9.
The student who killed Jo Soo-Ji’s (Lee Si-Young) daughter goes to this school and in episode 4 of Lookout (파수꾼) (MBC, 2017), Soo-Ji comes here to take revenge.
This school appears as Empire aka Jeguk High School in The Heirs (상속자들) (SBS, 2013).
In To The Beautiful You/For You In Full Blossom (아름다운 그대에게) (SBS, 2012), Koo Jae-Hee (Sulli) faked that this was the high school she goes to when her brother came to visit in episode 4. Here, it is an all-girl high school and the uniforms are also totally different from the ones in The Heirs.
Dongtan Global High School [동탄국제고등학교] is a high school located in Hwaseong’s neighborhood Bansong [Bansong-dong/반송동].
27 Dongtannaru-ro, Bansong-dong, Hwaseong-si, Gyeonggi-do
경기 화성시 동탄나루로 27
Geolocation: 37.188939, 127.078352
Seodongtan Station [서동탄역], Seoul Subway Line 1, Exit 1 or 2
(Best take bus or taxi from here)
— submitted by Marion KDL