If someone replies "ok" to your message, they all have different meanings in the way punctuation is.
Here are all the possible replies:
"OK"
Either they are one phone which autocorrects ok into OK, or they are really agreeing with you
"ok."
They are, again, either on phone or they are sick of
whatever crap you were
talking about
"k"
The most relaxed way of saying ok, nothing to worry about
"ok?"
Either they are actually asking you a question, or they are done with you and wanna get the hell out
"
mk"
You're talking to discord mods
"kk"
They understand and wish to proceed
"
kkk"
Another way of saying "alright alright calm down"
"OKAY."
They don't agree with you
"
oki"
You are talking to a girl, or someone whose overly enthusiastic
"ookkkkk"
They either have
broken 'o' and 'k' or they are exited
