Return of the Pearl on the First Day of the Yuan Dynasty

(No time travel, no rebirth, no system, no brainlessness, single female protagonist, please be careful if you mind.) One day, most humans suddenly turned into unconscious zombies, leaving only their bloodthirsty instincts and desire to kill. A handful of survivors who were born with antibodies survived the early stages of the viral outbreak. As time went by, the survivors united, gradually eliminated the zombies, and restored some order in the city. But the survivors discovered that there was another kind of human being...