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 smash a vengeful ghost's head with one punch.

He is the being most feared in the Ghost Realm.

The Ghost Realm offered a bounty of ten million units of ghost energy, ten thousand acres of ghost farmland, and a huge haunted house for him. But it all came down to one thing: "Give me something to eat, or I'll beat you up!"

He is Li Ran, whom even the System cannot cure.

[System: An idiot will always be an idiot. No arguments accepted.]