The Art of Treasure Appraisal

The Protagonist Is Reborn and Finds Bargains in Antiques

I'm looking for a novel. At the beginning, the protagonist collects scrap and has four brothers. The eldest goes to prison, one sets up a street stall, and one follows the protagonist. After the eldest is released, he encounters his enemy again and is beaten half to death. The protagonist takes the traditional betrothal gifts to ask someone for help. I don't remember much of what happens afterward.