Traveling into the Future, I Have Two Personalities in My Head

Future technology: Human beings have mastered prosthetic technology. As long as the human brain is immortal, they can obtain immortality by replacing prosthetic limbs. The protagonist travels to the future and accidentally discovers that another personality appears in his brain and competes with him for control of his body. As a time traveler, the protagonist has become the person with the most backward thinking. His thinking cannot keep up with future technology, and the protagonist has become an antique in future technology. But the protagonist unexpectedly discovers that another personality in his mind is the most precious godhead in the future! Commonly known as the second brain! Possessing this precious godhead, the protagonist becomes the target of competition among major forces, but their goal is for the protagonist's godhead!