Time Traveler Kai

Kai is a time walker who is one of the six time walkers created by the doctor from a book he read in his dream. During the doctor's research on reverse growth, he upgraded the reverse growth factor, which was originally slow, expensive, and extracted from the cruel but no side effects chemical element Gph5, into the "Tao" project, which successfully solved the original problem of "Tao" that improved the rejuvenation of human cells. It can achieve rejuvenation and is priced at low prices. Therefore, "Tao" has become a necessary reverse growth factor for newborns. Until the first doctor who injected "Tao" experienced serious side effects fifty years later, a large number of humans have been injected with "Tao". Before his death, the doctor issued a mission to Kai, the only one who stayed by his side. He hoped that he could bring back his self from seventy years ago, and eliminate all information and production related to the "Tao" project for the sake of all mankind. Kai brought back the 12-year-old Wu Bo'an from seventy years ago and tried to convey the doctor's wishes before his death. Unexpectedly, Wu Bo'an did not eliminate "Tao", but tried to change the equation of "Tao" so that it could continue to be used as a nursery to inject newborns. In order to verify its effect, Kai came to the world fifty years later and met many "immortal people". They are sterile but have endless lifespans, but their souls are unstable. There are a large number of mentally ill patients. Although they are immortal, they have several to dozens of different personalities in their bodies. This has led to more and more people practicing Taoism and Buddhism. They are eager to use this method to stabilize their only souls...