Where Have I Traveled Through Time?

When I woke up, I traveled to a completely unfamiliar world. Even in my limited historical knowledge, there was no record of it. What was even worse was that as soon as I traveled through time, I became the grandson of the emperor and the son of the prince. I was also labeled as a rebel. What was even worse was that even though I was the legitimate son of the prince, I was not favored! What to do with this start. . . This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.