C563 Experiment

"Damn it. System, why didn't you tell me earlier? You made me waste so much time here. "

Xu Tianyu said snappily.

"You didn't ask."

The System rolled its eyes at Xu Tianyu

"How much does it cost to experiment with mice, and how does it work? "Tell me quickly."

"The experimental rats were specially bred to adapt to the vile environment. His life is characterized by the laws of the world