My Identity as a Guardian Has Been Exposed

As a time traveler, I bear the responsibility of protecting the world. But in a census, Bu Bu's identity was exposed. "A legend that has been circulating for nearly a hundred years?" "What legend? I have lived here for more than two hundred years and I have never heard of any legend!" "What, you said I am that legend?" "Okay, I'll show my hand. I'm the guardian of humanity." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.