Helpp

Hii does anybody know the title of a manga where the FL was abused by the previous employee, having to produce lots of magical potions with low pay, and was finally able to resign and get a job in the same institution as ML.. She actually has extraordinary power to be able to produce that many potions, and the previous employee didnt realize it. The manga gives off japanese isekai vibes but it is not isekai...
Thank youu