A Swordsman Who Doesn't Want to Study Is Not a Good Time Traveler

The ancient era ended in the war between the gods and the blood descendants. The human race gradually rose in the ancient era. But now it seems to be declining. The continent of Kyushu, home to hundreds of ethnic groups, welcomed a visitor from another world after the blood descendants. What can he leave to this continent? Lin Yi, who traveled to the Kyushu continent due to an accidental death, believed that he must live his life again as he wished. What kind of waves will it cause in this world?