The End Is Coming: Am I Actually the Zombie King?

[Zombie synthesis system, cool post-apocalyptic article] The end of the world is coming, there is a global crisis, and zombies are rampant. Zhang An comes through time and prepares to kill the zombies with a knife to save his life! Ding—Congratulations to the host for binding the zombie synthesis system, which can synthesize low-level zombies to improve its own combat effectiveness. What? I turned into a zombie?! Faced with the siege of superpowers and the pursuit of Zhang An by other zombies, he could only continue to upgrade and strengthen himself. Why did you accidentally become the zombie king?