In the Prehistoric Times, I Will Become Stronger by Guarding the Heaven.

Qin Mu traveled through the prehistoric world and was bound to the Guardian Heaven System. By guarding Heaven, he could obtain various rewards. Bite! You maintain law and order and reward thousands of years of merit. Bite! You kill the Xuanxian Demon King, protect the peace of the world, and be rewarded with innate low-grade spiritual treasures. Bite! You help the Jade Emperor secure his position as the Heavenly Emperor and reward Hongmeng Purple Energy. Thousands of years later, when Qin Mu stood on the top of the ancient world. All the heavenly officials asked Qin Mu how he achieved such an achievement. Qin Mu replied, just protect the heaven. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.