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Song Ji Hyeon is a surgeon, as well as a genius doctor appointed as the youngest lecturer at Seoul ...
This girl reincarnates to her past past life, need an explanation? Here: So she was originally a villainess but then she got a death sentence. She reincarnates as a girl in Korea and becomes a very talented doctor in order to make up for her past life's sins. Of course then she dies again and reincarnates as the villianess from her original life.
So now she uses her medical knowledge in order to survive as the villainess.