Du Ziteng, who was bankrupt and in debt, accidentally activated the double door, and his convenience store was connected to the wasteland of 3000 years ago! The store is absolutely invincible and can absorb superpower crystals 100% safely. A bucket of instant noodles can be exchanged for gold, and a spicy stick can be exchanged for future black technology. In reality, he builds a technological empire, and in the end of the world, he builds the main city of mankind!
