C594 Acid Rain

Zheng Zi walked over and noticed the black smoke in the distance. She stood beside Zhuang Chen and looked at him with confusion.

"Logically speaking, humans are all gathered in the safety zone. Why would there be smoke in such a remote place?"

Hearing Zheng Zi's doubt, Zhuang Chen naturally understood.

"There are so many things happening in the post-apocalyptic world