Keryu's system allowed him to have two lives, which was its best function.
Of course, some preparations were needed to get a second life since a body that had died couldn't be revived. It was against the laws set by the world.
Soul transfer, however, was possible.
That was what Keryu's system did.
All he needed to do was prepare a body in perfect condition and keep it breathing even if it had no soul.
It would've been impossible, but with the knowledge Keryu had of the future, he knew of a liquid that could keep the body breathing by sending oxygen through its skin.
It was something someone had developed later, but Keryu had stolen the recipe for himself.
However, did Alex not know about it?
Of course, he did.
The only reason he let Keryu be killed by the Wandering Emperor was because he knew that Keryu would do this soul transfer.
