We Are in the End of the World, Unlock the Flying Thunder God at the Beginning

(In the apocalyptic system, the protagonist is a normal person, not a cold-blooded pervert. If you don't like it, don't enter.) (Too many elements, welcome to interact) When a zombie swarm landed at the beginning, the system actually compensated me for the Flying Thunder God Technique? Zhang Kuo, a spirited young man who died for a righteous cause, was accidentally bound to the system. After being reborn, he was thrown into the parallel world of zombies. In order to find his sister, who he once depended on for life, he embarked on the road north. But he never imagined that accidents would occur frequently in the system, and he would eventually be forced to exile himself to a bear-infested world where he cut down trees for ten years... (This book has been completed, and the follow-up is being created. Please look forward to the sequel: The Bizarre Adventure of Only Strong.)