What dialect is this colloquial language?

I came across expressions ending with '-음' while reading sentences. For example, there was a sentence like, 'It's quiet and not bad in terms of cost-effectiveness.' I would like to know where such forms of expression are commonly used. This expression often ends in a descriptive manner, such as 'There were mosquitoes' or 'The window is narrow and the glass hasn't been cleaned.' I'm curious if this is a dialect commonly used in a specific region of Korea. I would like to hear opinions from anyone who knows this expression or has had similar experiences. If you have frequently encountered such expressions in Seoul or other regions, or if it carries a specific meaning, I would appreciate it if you could share.