Except for Me, Everyone's IQ Has Been Reduced by 200

Yang Fan traveled to a world where human intelligence was extremely low. He was originally mediocre, but now he has become a genius? "Brother Yang Fan, how do you memorize this multiplication table? I have memorized it many times and still can't memorize it." ... "Yang Fan, please tell this professor how you immediately calculated that one plus one equals two. I'm going to apply for the Gi*s World Record." ... "Master Yang Fan's book I Washed My Mother's Feet has won the Nobel Prize for Literature. This work can be called an epic masterpiece and discusses the tragedy of human society in the last century." ... I am Yang Fan. If you continue to praise me, I will call the police! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.