Question

이태원에 있는 바에 갔는데, 주인이 완전 웃긴 놈이었어요 In its 'and' additional meaning, -(으)ㄴ/는데 marks the clause communicating background information related to the main message reported in the second clause. The first clause usually conveys something useful that is expected to help the hearer understand the situation better.

Accepted Answer

I went to this bar in Itaewon, and the owner was a real jerk

Front	이태원에 있는 바에 갔는데, 주인이 완전 웃긴 놈이었어요
Back	I went to this bar in Itaewon, and the owner was a real jerk
Notes	In its 'and' additional meaning, -(으)ㄴ/는데 marks the clause communicating background information related to the main message reported in the second clause. The first clause usually conveys something useful that is expected to help the hearer understand the situation better.

Clause 이태원에 있는 바에 갔는데 주인이 완전 웃긴