um; uh; erm

Explanation

1. um; uh; erm
An exclamation used when one cannot immediately think of anything to say.

2. um; uh; erm
An exclamation used when one is hesitant since he/she finds it hard to bring up something.

Examples
저기…… 저…… 무슨 말을 해야 할지 모르겠군요
저, 갑자기 여쭤 보셔서 제가 그분 성함을 잊어버렸습니다만
선생님, 저…… 시간 좀 내주실 수 있으세요?

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