mhm; uh-huh

Explanation

1. mhm; uh-huh
An exclamation uttered when the speaker agrees with the other party's words.

2. hm; mmm
An exclamation uttered when the speaker does not like something or feels anxious about it.

3. hm; um
An exclamation uttered when the speaker cannot believe something.

Examples
음, 그럴 듯하네
음, 네 말이 맞는 것 같아
음, 그 말도 일리가 있군요

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