For Ye Weiming, accomplishing this was not particularly difficult.
Though he could not regrow severed limbs, he was quite skilled at limb transplantation—and very skilled at it, at that!
After all, under the medical conditions of the main world, an operation like limb transplantation was essentially an impossible fantasy. Yet in the story setting of the Wind and Cloud Secret Realm, it was nothing more than routine practice.
There was certainly more than one Super Master physician capable of such a thing!
As it happened, Ye Weiming had inherited medical knowledge from the Wind and Cloud Secret Realm that specialized in this very field. As long as he could resolve issues such as rejection reactions, replacing someone's parts was entirely within the scope of his usual work.
By comparison, making Yang Guo grow younger until he looked even younger than Xiao Longnv was the more difficult matter.
After all, rejuvenation was an extremely difficult, top-tier operation in any work that was not mythological in nature. In most cases, it simply could not be done. Even if it could, it would certainly be cutting-edge black technology, never something commonplace.
For example, in the Wind and Cloud Secret Realm, only a handful of the absolute strongest individuals could achieve immortality.
Fortunately, when applied to Yang Guo, this ability was merely a side effect. Ye Weiming did not need to put any additional effort into it.
That was because the right arm he had transplanted onto Yang Guo was the severed arm he had cut from Di Shitian in Lingyun Cave!
This severed arm contained the Phoenix Blood, one of the Four Auspicious Beasts of the Wind and Cloud Secret Realm, and naturally possessed the miraculous effect of granting immortality. Perhaps it could not keep a person forever young, but Yang Guo was