Looking for this title (romance, webtoon, fantasy,manhwa))

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.