City: My Vampire System

Humans are at war with the invading Dalki, and a group of people who have been hiding in the shadows for hundreds of years begin to come forward. Lin Fan lost his parents due to the war, and the only thing he inherited was an old book. However, when the book was finally opened, Lin Fan was granted a system He completed one mission after another and became stronger, until one day the system sent him an uncertain mission "It's time to eat!" "You must drink blood within 24 hours" "Otherwise your health will continue to decrease until the mission is completed" Lin Fan:? ? ? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.