After Transmigrating into a Substitute Villainess, She Had the World in Her Hands with Her Medical Skills!

Intro: A brief introduction: Princess, the Prince is going to assassinate you again today. Upon transmigrating into a novel, a divine doctor from the apocalypse found herself in the body of a cannon fodder princess. She had thought she'd escaped the survival struggles of the apocalypse for a happy and leisurely life, only to realize she had merely exchanged one difficult survival scenario for another. This esteemed divine doctor would not be treated as a substitute! Bring on the poison! Wait, this crazy prince looks exactly like her first love! A mutual stand-in romance, who's afraid of whom?