Scavengers on the Ruins

I once thought that the future of mankind was to conquer the stars and the sea, but I never thought that the entire universe would be a big ruin. Facing the relics left by ancient civilizations, mankind turned to a new direction, a future where all people scavenged. Everything from food, drink and clothing to spaceships and cannons is in the ruins. After picking up one planet, replace it with another. Our protagonist Shen Heng will undoubtedly be the best salesman among many garbage pickers. The story also begins when he gets a learning device that can implant memories.