We see this gate in a sort of panorama shot in episode 16 of Falsify (조작) (SBS, 2017).
On their date in episode 9 of Chicago Typewriter (시카고 타자기) (tvN, 2017), Han Se-Joo (Yoo Ah-In) and Jeon Seol (Lim Soo-Jung) take the Seoul City Tour Bus [서울시티투어] — with ghost Yoo Jin-Oh (Ko Gyung-Pyo) tagging along. They also pass by this gate.
Sungnyemun Gate [숭례문], unofficially rather referred to as Namdaemun Gate [남대문], is Korea’s National Treasure No. 1. It constitutes one of the eight gates of Seoul Fortress Wall.
The gate is located in Jung-gu, between Seoul Station and City Hall.
Adress: 서울 중구 세종대로 40
Geolocation: 37.559956, 126.975291
To get here: Hoehyeon Station [회현역], Line 4, Exit 5 or City Hall [시청역], Exit 8 or 9