ㄴ가 살다

not one expression, but filler

What got flagged here is the tail of words like 뭔가 "something, somehow," 언젠가 "someday" and 누군가 "someone" sitting in front of 살다 "live." In most lines it is 뭔가 살면서, where 뭔가 is a vague filler adding little: 뭔가 살면서 좀 보람이 있었던 그런 일들이 있을까요?, 그런데 뭔가 살다 보니까 혼자만 알고 있는 게. The remaining lines are different words entirely — '한국에서 언젠가 살고 싶다', 옆에 있는 누군가 살아서. The lines are consistent enough to explain, but they do not add up to an expression with a meaning of its own.

Register: casual

The examples below did not fully pin this one down — read them before relying on the entry above.