From the Start, I'm a Psychiatric Patient Who Can Smash Evil Spirits with One Punch

He is a severely mentally ill patient. He can punch a vicious ghost's head clean off. He is the being the Ghost Realm fears most. The Ghost Realm offers a bounty of ten million units of ghost energy, ten thousand mu of haunted fields, and a giant haunted mansion for him. But it always ends the same way: "Give me something to eat, or I'll beat you up!" He is Li Ran, the one the System can't even cure. [System: An idiot will always be an idiot. No objections will be entertained.]