The First Sword to Kill a Ghost

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.

Windbreaker, Miao Knife or Long Knife, Less Talk, High Fighting Power

The Protagonist Has Strong Martial Arts Skills but Is Relatively Low-Key, Martial Arts Type

The protagonist is very powerful in martial arts and everyone in the world has heard of it. However, due to some changes, he hides his identity and strength. However, he often has to take action for various reasons. After arousing suspicion, he comes back with his words.