It's the story of Changsheng and Jianli, the second male swordsman in the next door pit, that is, Rein.
Or an excerpt from the story:
After continuing to dig for an unknown amount of time, his shovel hit something.
It was a long and narrow iron box that had been buried here for an unknown period of time and was covered with rust. Wind's hands covered with blood blisters trembled and tried to break the lock on the iron box with a shovel. These were a pair of bread-making hands. Now they were shamefully stained with blood and covered with scars. They snatched other people's lucky things just for the hope of survival. Naturally, they could open Pandora's box. When Feng shoveled it down, he discovered that the entire box had become rusty, brittle, and vulnerable. There was something inside that was tightly wrapped in tattered velvet, and it collided with the digging tool in his hand, making a clear and unusual sound of gold and iron.
Purpose: Don't pick up long swords on the roadside