Doomsday Puppet Master

When Li Muchun woke up, he found that the world he lived in had changed drastically, with a dilapidated city, bloodstains on the ground, and zombies wandering on the streets. Also, a system that randomly assigns professions to oneself in one's sleep. Hey, this time traveler seems good. Can I switch to this profession? Yes, just reactivate the system. How to reactivate it? Let me try this profession! As long as the host dies, it will be re-parasitized. . . . . . . This puppet master is pretty good too, hahaha, there's no need to change it.