Under the City of Ember

After the catastrophe, there is order within the high walls, and ruins outside the high walls. Lin Xiao originally thought that his greatest wish in this life was just to live. Until that day, deep in the abandoned city, he picked up a mecha that shouldn't exist. Someone wants to take it away. Someone wants to take advantage of it. There are also people who want to use it to drag the entire city back into the abyss. When lies build a high wall,