In Strongest Deliveryman (최강 배달꾼) (KBS2, 2017), this cafe is named ‘Coffee World’, and is where Lee Ji-Yoon (Go Won-Hee) works part-time as a barista. She has a second run in with Oh Jin-Gyu (Kim Sun-Ho) in episode 2, and he causes a scene in the cafe when she makes a mistake. Later in the episode, Lee Dan-ah (Chae Soo-bin) meets her younger brother here and verbally disowns him and the rest of her family.
In real life, this is one of the Korean franchise outlets of the American chocolate company Rocky Mountain Chocolate Factory, based in Durango, Colorado, USA. This outlet is located in Samseong-dong, Gangnam-gu, Seoul, just opposite the City Airport Tower [도심공항타워빌딩] on the side of COEX’s west gate.
Address: 39, 87-gil, Teheran-ro, Gangnam-gu, Seoul
서울특별시 강남구 테헤란로 87길 39
(서울특별시 강남구 삼성동 153-55)
Geolocation: 37.5103004, 127.0576253
To get here: Samseong Station [삼성역], Line 2, Exit 5
— submitted by Mich