Thousands of Tricks, I Can Defeat Them All with One Sword

He once saved the people and the country with one person and one sword, but now he opened the most ordinary bookstore in the border area. Perhaps only he himself knows what he is looking for, along with his mute uncle who was once a murderous demon but is now a servant, and his little brother who is a martial arts prodigy. Many people hope that he can still stand up and regain his former glory. But he only hopes to live for himself and for the promise he made back then. Whether he can achieve his wish, perhaps only God knows.