Exiled to the Lower World at the Start

Chen Xuan accidentally traveled through time and became the prince of an imperial kingdom in a fantasy world. However, he was exiled to the lower world and began a life that defied heaven. Three hundred years later, an emperor of a certain empire suddenly remembered that he had a son, and asked his guards: "How long has the prince been exiled?" "Your Majesty, it's been three hundred years." "Does he regret it? Is he willing to give in?" "Back to Your Majesty, His Royal Highness is already stronger than you, and has led troops to attack the upper realm, saying that he will blow your head off and overthrow your corrupt rule!" "???" A certain emperor. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.