Transmigrated as a Lighthouse Keeper, but I'm Sealing an Evil God!

While fishing at a wild lake, Jiang Huan accidentally fell into the water. When he woke up, he was shocked to find that he had become a lighthouse keeper in the Steam Age. Good news: He transmigrated and landed a high-paying job where his monthly salary equals half a year's wages for an average person. Bad news: His workplace is a lighthouse on an isolated island, his only "colleague" is a mummified corpse, and he is afflicted with a curse that makes him hallucinate every day as if he'd eaten magic mushrooms. By day, he inspects the buoys; by night, he fights off hallucinations. Whispers echo in his ears, dark shadows lurk outside the window, and he has a diary filled with the scribblings of a madman. It wasn't until he discovered the mummified corpse, a bottle of "Spirit Vision Potion," and a sharp-tongued ghost who had been trapped for fifty years in the lighthouse's basement— That he finally realized he hadn't taken over a lighthouse at all. What he was actually guarding was the sealing fire suppressing a divine abomination!