Start Herding Cows. My Cow Is a Cow Warrior.

Bai Han, a sixteen-year-old boy, was struck to death by lightning because he was doing homework at night. When he opened his eyes, he found that he was not dead, and that there was also a "system that obeys everything you say." Slowly, he learned that the novel he read in his previous life was in Douluo Dalu. (This book is not a travel book about the world)