Xiao Wu was not considered a typical son of destiny by Han Xuhan's system. The quest description of Xiao Wu's role in the storyline was rather vague.
But the quest itself was not easy to sail through. In the three months of knowing each other, Han Xuhan had tried numerous times to dig out the secret that the System was guiding him towards through the Quest.
But the progress bar for the Quest had been stuck at 1% the entire time.
Today, after getting just one glimpse of this secret Mystic Art that Xiao Wu was cultivating in his backyard, the progress had shot up to 16%. The implications were clear.
This Mystic Art was the secret that his system wanted him to explore while interacting with Xiao Wu.
One of the rewards for completing the Quest was the opportunity to enter a fragmented world, probably like the Holy Land of Laws. Just like how one had to learn the language of laws to explore the Holy Land, Xiao Wu's Mystic Art was definitely connected to this fragmented world.