Protect the Fake Saintess!

What is the true identity of the most beautiful woman in the kingdom?! Dana was a high school senior in Korea who was about to take the CSAT. Unfortunately, she gets hit by a truck and is reincarnated in the romance fantasy world. I was trying to live comfortably in this life, but what is the secret of the saintess whom I suddenly met?! I don't want to die, so I'll protect the saint's secret!