Fight, Primitive Man

*He is a surgeon with a bit of a reputation.
But discovered that when he woke up, he was actually kicked into the ancient time which ten thousand years ago. In this primitive world, there were dinosaurs from the Cretaceous Period, giant beasts that were comparable to small mountains, and the legendary Barbarian Bone Warriors which can cultivate.
With his excellent surgery skill what should he do? And what secrets are waiting to be discovered？