The Feng Shui Master Reborn as a Cannon Fodder Turns the Tables by Relocating the Villain's Grave

Transmigrate into a book, the villain dies young, move a grave to change fate, the plot goes off the rails.

I transmigrated into the first cannon-fodder character to be buried alive beside the villain, but I casually moved his grave for him, and he ended up living long enough to become the male lead.