"Metamorphosed body? After learning Vajra Body, you can't learn Metamorphosis Body anymore, at most you can study the Metamorphosis Body technique for movement." Du Gang found Zheng Yichen's question a bit strange; in his world, there were also some geniuses from the ancient capital or Metamorphosis City who wanted to learn both the Metamorphosed Body and Vajra Body at the same time.
In the end, they all failed. Even he couldn't do it, although some people from the ancient capital and Metamorphosis City wanted to take the Evil Path, combining and producing offspring to see if the mixed-blood descendants could learn both at the same time. However, as inhabitants of a world, even with the changes from mixed blood, they were minimal.