Don't Mess with Me, My Grandfather Can Kill Ghosts and Become Gods

Protagonist: Wang Lei Core golden finger: Summon Grandpa to Death (Wang Zhan) → Kill ghosts and devour upgrades → Kill all the way from low-level wild ghosts to ghost emperors and gods. World view: modern parallel world + spiritual energy recovery + ghosts running rampant + official ghost removal agency + underworld order + god list Style: Relaxing and refreshing writing, urban supernatural, decisive killing, tenderness between grandfather and grandson, system assistance