Question

잘 모르겠어요 Phrases with -겠- tend to sound less assertive and more gentle and polite. That is why -겠- often occurs in idiomatic expressions. In particular, it is quite common for -겠- to appear with verbs of knowing (알겠습니다) and not knowing (모르겠습니다) to soften up the fact of someone knowing or not knowing about something.When talking about intentions or will of a third person, -(으)ㄹ 거- should be used in place of -겠-.

Accepted Answer

I don't really know.(I wouldn't know.)

Front	잘 모르겠어요
Back	I don't really know. (I wouldn't know.)
Notes	Phrases with -겠- tend to sound less assertive and more gentle and polite. That is why -겠- often occurs in idiomatic expressions. In particular, it is quite common for -겠- to appear with verbs of knowing (알겠습니다) and not knowing (모르겠습니다) to soften up the fact of someone knowing or not knowing about something. When talking about intentions or will of a third person, -(으)ㄹ 거- should be used in place of -겠-.

Knowing 겠 잘 모르겠어요 I Phrases Tend Sound