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First the martial arts, then the immortal, and finally a hodgepodge of Cthulhu. When the protagonist got the time-travel system, he thought he was developed, but after he actually time-traveled, he discovered that he couldn't take anything with him except knowledge and memory. Since the birth of human beings for millions of years, in the history of the earth, human beings are not the most capable of fighting, nor are they the strongest. But in the end, the overlord of the earth is human beings. What is the reason? Humans learn! The first world - Swordsman, I am Lin Pingzhi.