C382 Training Instinct

After explaining his idea to Qin Feng, Qin Feng thought about the ancient era. When there was a time when people were pure, the population would be especially large. It couldn't be true mating. If it wasn't mating, then Nether King's words would be more reliable.

But what that method was, Qin Feng and Nether King could not know. After all, everything was just a conjecture between the two of them