This mansion appears as idol’s Tony’s house, in front of which Sung Shi-won (Jung Eun-ji) squats fangirl-style in a paper carton on the sidewalk in episode 3 of Reply 1997 (응답하라 1997) (tvN, 2012) to be able to see him. “Oppa, I love you,” she manages to tell him after hours of painful waiting.

This mansion is located in Seoul’s neighborhood Pyeongchang-dong [평창동], in the Jongno District [Jongno-gu/종로구].
It has been thoroughly renovated (if not replaced) in 2014 and doesn’t resemble the house seen in Reply 1997 anymore (see Daum screenshots).

Address
479-1 Pyeongchang-dong, Jongno-gu, Seoul
서울 특별시 종로구 평창동 479-1
(서울 종로구 평창30길 41)
Geolocation: 37.613159, 126.974767

Getting here
Hongje Station [홍제역], Seoul Subway Line 3, Exit 1 or 2
Prepare for quite a walk or take a taxi.
 
— submitted by Marion KDL