My Sister and I Are Zombies in the End of the World

Yang Fan traveled through time and not only gained a sister, but he also became a zombie. Before the end, the two depended on each other and lived a happy life. After the apocalypse, zombies are rampant and troubled times are coming. Yang Fan's sister turned into a zombie. In order to save him, Yang Fan bit his sister and turned her into a zombie. From then on, there were two more zombies in the world. In order to protect and awaken his sister, Yang Fan had to embark on a road to become stronger. Fortunately, Yang Fan has a system. As long as he sucks the blood of others, he can extract the genes in other people's blood and make everything of others exclusive to him.