End-of-the-world infrastructure: starting with a convenience store

Three years after the end of the world, a convenience store with electricity suddenly appeared in the deserted city, and inside sat a round-faced girl with a German Shepherd lying at her feet. When Cheng Sui was selected, she was watching Cheng Zi lying on her bloody body and dying. After traveling through time, she only wanted to work diligently with her dog to build infrastructure, and then make money lying down. However, these tasks one after another... Forget it, infrastructure workers are the best!