No matter how Qiao Yu answered, he planned to have a good talk with this little guy to make him realize the seriousness of academic research.
Not working on your own proposed topic, and running off to nitpick when others publish important results—even if you're young and uninformed, this behavior, if not corrected, would make you an enemy of the mathematics community in the future.
After all, people grow up, but habits may remain.
Although he decided to aid a bad habit this time, it was necessary to criticize sternly and at least make sure it didn't happen again.
But who knew Qiao Yu would immediately reply: "Director Tian, it's not like I suddenly became interested in the Geometric Langlands Conjecture. In fact, I've always been working on the topic you assigned to me, but during my research, I happened to come across this conclusion while looking up some things.