Horror

Free on Webtoon
She reincarnates into the body of the FL of a strictly romance novel. Even though she follows the story line as closely as possible on the day of the confession the story genre changes and there is a zombie apocalypse
Every time the MC is killed she goes back in time to the morning of.

Same creators as Bastard but I personally prefer this story
The MC's family died in an accident and he moved out of his house into an apartment complex.
People begin to get infected and change into monsters triggering the apocalypse. Can the MC and the other tenants survive?