Mafiaaa's Things

The female lead works as a doctor's apprentice, unaware that her mentor is actually her biological father. Both have been searching for each other but keep narrowly missing their chance to connect. The father believes his daughter has blonde hair, like his late wife, while the female lead has no clues about her family's identity. Later, an advanced DNA test was created and one colleague already has suspicion did the test and it reveals that they are, in fact, related.

So MC is very powerful and being recruited by a short/medium brown hair girl (she wanted to make a private institute? A hunter teaching academy) I remembered shes a B rank and she is daughter/granddaughter of a prestigious family. Her family known for their sword and she trying to prove to her family in some sort of way...