Time Travel for All: the Demon King and the Brave Man

All members travel to a world where there are demon kings and brave men. Those who travel through time will become demon kings or brave men, and their subordinates must be recruited by themselves. Our protagonist Wang Tianyu has become a demon king whose race is undead, causing undead in a different world. Demon kings and brave men fight each other, develop their power, and fight local demon kings and brave men. Who will win the final victory: This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.