After Building the Foundation, I Became the Ancestor of the Earth

Zhao Jian, a young man from Earth, accidentally traveled to a different world. After years of hard work, he finally completed the foundation, but by chance, he returned to his hometown. At this time, the earth has ushered in a revival of spiritual energy, ferocious beasts are running rampant, alien beasts are causing disasters, and human civilization is on the verge of catastrophe. In a desperate situation, human beings can only rely on technology to survive, but there is no way to cultivate immortality. The protagonist returns with the skills from another world and uses the power of cultivation to protect his homeland. During his cultivation, he uncovers the shocking secret of the disappearance of ancient immortal cultivators on Earth.