Shocked, I Lived with My Grandfather for 100 Years

The protagonist in the modern era of life accidentally enters the era when his grandfather lived. Unfortunately, what he doesn't know is that there is a mastermind behind everything behind this. Can the protagonist come back successfully with the help of his grandfather this time? Stay tuned for the day when my grandfather and I meet in another world. . This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.