Sweeping Dust Asked

Chen Jian, a modern civil engineer, traveled to the world of cultivation with no system and only a rusty broom. When others were flying with swords, he was sweeping the floor; when others were refining elixirs and enlightening themselves, he was repairing toilets. Until one day, his enemies came to kill him, and he accidentally swept out an ancient sword mark - he had been scanning this place for ten years, and he had also understood it for ten years.