고 들어오다

do it, then come in

Physically: you do the first thing and then step inside. 문을 열고 들어온 그곳 'the spot you come in through when you open the door', 지나가다 지금 보고 들어왔어요! 'I was walking past, saw you, and came in.' Two lines use the figurative 치고 들어오다, cutting in on someone — an instant joke ([훅 치고 들어온 아재 개그]) or an opponent moving on you in a fight. Its opposite is 고 나가다, doing something and then heading out.