I, in the Foundation-Building Period, Strive to Become a Saint

Traveling to the Xianxia World System released a main mission called [Invincible]. But at the beginning, the world was in the early stages of prehistoric times, great powers were everywhere, and the Immortal King was inferior to a dog. Luo Chenyu only had cultivation in the foundation building stage. In order not to be used as cannon fodder, he decided to use the "Gou" formula to develop in an insignificant way using unlimited lifespan and experience bar.