Dark World: the Origin of the Seven Gates

From Xi'an to Dunhuang, it's seven hundred kilometers and seven gates. Me who repairs mobile phones and electrical appliances, the female rider who delivers food, the monk who chants sutras and eats meat, and the old man who DIYs mechas from scraps - four people. Total wealth: a soldering iron, three boxes of scrap parts, and a thermos cup. Opposite are the quantum pulse cannon, Yuanchu alloy armor, and anti-matter disruptor. The first battle lasted three minutes. Didn't win. But he didn't lose either. That's enough. ——Because I have an ability that they don't have. I can make those seven doors open one by one. They can only follow me to see what I can dig out of these doors.