Peerless Immortal Son-in-law

*Five thousand years ago，he suddenly swallowed the immortal pills made by the female Divine Snail. Since that his soul becomes immortal which can transfer into a another body after his last body  dying.
For all those years, He was an emperor who ruled over all six lands.
He was a sword master who taught people the swordsmanship.
He was a teacher of Godly Doctor.
......
But he just can not make his body immortal.
This life , he is actually a son-in-law.
After all those identities，Can he achieve his ultimate goal？