Searching for manhwa

So, this is a bit of an older one, not too far back tho, shoujo or josei set in korean historical environment, not transmigration but isekai.

MC works at a call center and has an impeccable work smile, spends a long time with an unsatisfied, unreasonable customer but remains very polite, turns out this 'customer' is an emperor who in some weird way communicated with her, unclear how, she ends up in that period of the past, where he hires her to be his 'translator' empress aka to do problem management while he curses and threatens to kill everyone, she's there to defuse the situation basically. Comedy aspect was strong.