Protect the Fake Saintess!

Dana, a Korean high school senior just days away from her college entrance exam, meets an unlucky end. Hit by the infamous "romance fantasy truck" and reborn in another world, she figures she might as well make the best out of it, but she suddenly stumbles across the Saintess's secret! "I don't want to die, so I guess I'll keep the cat in the bag, Saintess!"

(Source: Webtoon Entertainment)