This is Cha Su-hyeon’s (Song Hye-kyo) apartment in Encounter/Boyfriend (남자친구) (tvN, 2018-19), as seen in episode 2.

La Terrasse Hannam [라테라스 한남] is a luxury apartment building located in Seoul’s neighborhood of Hannam [Hannam-dong/한남동] in the Yongsan District [Yongsan-gu/중구], which overlooks Dongho Bridge [동호대교].

Address
118 UNvillage-3gil, Hannam-dong, Yongsan-gu, Seoul, South Korea
서울특별시 용산구 유엔빌리지3길 118
(서울특별시 용산구 한남동 773-1)
Geolocation: 37.538183, 127.015456

Getting here
Oksu Station [옥수역], Seoul Subway Line 3, Exit 3
or
Hannam Station [한남역], Gyeongui Jungang Line, Exit 1
(Rather out of the way, so best to take a taxi!)

— submitted by Mich KDL