The Devil Can't Survive After 90 Days!

Yidun, a boy who suddenly fell from the sky can only remember two things: His name, and the fact that he will cease to exist if he doesn't find the 5 hidden treasures to defeat the demon king. With only 79 days left to find the treasures Yidun still cannot pass by people who are in need without lending a helping hand. Can he defeat the demon king in under 80 days and avoid his death?