The Snow Emperor had made this choice before Qin Huang could. As for entrusting Qin Huang? The Snow Emperor—or rather, anyone else who had obtained the qualifications of a fisher—probably would never have entertained such a thought.
The root cause was still Qin Huang's overwhelming strength. Although the character he had displayed could be considered kind and benevolent, no one dared gamble on what lay behind that kindness.
The Boundary Abyss Sea was a place where truly tremendous surprises might appear. If one really fished up a precious treasure in such a place, it would be fine if it had nothing to do with Qin Huang's Dao Path. But if it could help him break through to the Near Emperor stage, or even prove useful in reaching the Immortal Emperor Realm, then no matter how noble a person's character was, it was hard to say whether he would truly refrain from acting against the fisher himself.
In the Snow Emperor's view, although Lu Wushuang's strength had indeed improved, she was not too worried that he would pose a threat to her. Whether she could defeat him was another matter, but at the very least, if a treasure truly appeared, there was no possibility of it being snatched away by him.
Even someone of the Snow Emperor's strength thought this way, so how could anyone else dare entrust Qin Huang to enter the Boundary Abyss Sea alongside them? Would that not be inviting the guest to become the master...?
Since you did not object to entrusting Xue Qianxi, the matter was quickly settled. However, the reward you offered differed from those of the others. You did not intend to share your gains with him, instead planning to settle the payment in one lump sum.
The two methods of payment represented stability