
I put this on hold and plan to reread this after it’s completed, but I got curious and read the latest chapter… So, is FL not the daughter of the count? Was the blood test fake?

The blood test is not fake. She is not the daughter of the count. Meaning, her mother did not commit adultery/cheat with the count (her mother's ex lover from when before she got married to the duke)
Therefore, the mc is the daughter of Duke Reston, the old blondie (one of the antagonist of the story)
Usually with these kinds of stories, the temple is corrupted and exploiting the saintess. Thankfully, this manhwa broke that trend… Also, ML is so at this point it seems like he’s the one with the curse with how busy he is researching for a cure