Supernatural: I Opened a Yin Yang Inn

I Want the Protagonist to Be Strong, Go into Seclusion, Open a Restaurant, Encounter Various Things, Martial Arts Type

The protagonist is very strong and low-key, looks down on the world and retires, runs a small restaurant, and then encounters various troubles and is forced to take action. It is best to be a martial arts type.

It's Related to the Underworld, the Male Protagonist Opens a Shop in the Human World,

The male protagonist is invincible, doesn't mind other people's business, and just takes action to solve the problem.

The Protagonist Has a Job in the Underworld and Many People Know His Identity.

Is there any occupation for the protagonist in the underworld, such as driving corpses, sewing corpses, keeping vigil, etc. Thank you all.

There Is a Shortage of Books, so I Am Looking for Books About Supernatural Beings and Taoist Priests!