At Gangnam Station, Olive Young Central Gangnam Town (403 Gangnam-daero, B1-4F)

is right by the station and open until 10:30 pm, with many floors and brands, so leave time. 센녹 Perfume comes in 30ml and 50ml, 3.9K+ reviews, rated 4.8; 에틀리에 Eau de Parfum is rated 5.0. There are several more Olive Young stores around Gangnam Station.