In the World of Fairy Tail, I Can Be Rewarded by God.

Luo Yun traveled through time and space into the world of Fairy Tail. But it was very unfortunate that Luo Yun traveled to the island where Erza was enslaved by the Black Magic Order in the early days. He worked very hard mining every day, and felt very uncomfortable without enough food and sleep. Fortunately, Luo Yun is not without hope at all. Luo Yun has obtained the God's reward system. Every hard work will be rewarded. There are no bottlenecks and no upper limits. Given time, he will become a great success!