Kang Chul (Lee Jong-suk) gets stabbed on the rooftop/heliport of this hotel and is saved by Oh Yeon-joo (Han Hyo-joo) in episode 1 of W Two Worlds (더블유) (MBC, 2016). The same scene is shown in episode 5 where we learn that it’s Yeon-joo’s father, Oh Sung-moo (Kim Eui-sung), who stabbed Kang Chul.
This building is located in Seoul’s neighborhood Yeoksam-dong [역삼동] in the Gangnam District [Gangnam-gu/강남구] — however, the hotel is apparently permanently closed.
Address: 237 Teheran-ro, Gangnam-gu, Seoul
서울특별시 강남구 테헤란로 237
(서울 강남구 역삼동 676)
Geolocation: 37.503125, 127.041526
Getting here: Yeoksam Station [역삼역], Seoul Subway Line 2, Exit 8
— submitted by Marion KDL