무인 매장이 · 무인 매장을
unstaffed store, self-service shop
Example
집 앞 무인 매장에서 아이스크림을 샀어요.
I bought ice cream at the unstaffed store in front of my place.
Word parts
무 none+인 person+매 sell+장 place
무인 'no person' + 매장 'store' (literally 'selling place').
Good to know
Common types are ice-cream shops, laundromats and study cafés: you pay at a kiosk while CCTV keeps watch.