In Seongsu, try Olive Young N Seongsu (13 Yeonmujang 7-gil) and Olive Young Beauty Mansion Seongsu (108 Seongsui-ro, B1-4F), both 10 am to 10 pm, easy after cafés and pop-ups. round A'round Scented Hair & Body Mist is 100ml with 5,405 reviews, fine for hair and body and OK for carry-on.