Anybody knows who those two guys are on chap 3? One had a cog and the second one was weari...

I don't know which one, but this is in a series of other manhwa & I'm pretty sure they all cameo in other stories, I think the series was called ganggwon apartment complex or something & they're probably from another story. Not super helpful ik but gl finding them I'm searching as well

Nvm it's gwanggong industrial complex u can see it in the url, gl searching bai ヾ(❀╹◡╹)ﾉ~

https://www.mangago.zone/read-manga/gwanggong_apartment_complex_clean_freak_sunbae/

I'm decently certain it's this