Kim So-hyun's acting in the drama "Love Doctor" feels just like someone else's

The voice and way of speaking of the female lead Kim So-hyun in "Love Doctor" felt familiar, so I kept wondering, "Who is it? Who is it?" and then I remembered—her voice tone and manner of speaking are exactly the same as Yoon Eun-hye in "Coffee Prince."
I wonder if she studied while watching Coffee Prince.