I Was Reborn as His Highness the Prince's Little Evil Dragon

After living and working for eighteen years, a diligent college student was assassinated and reincarnated into a dragon. To make matters worse, he has become the game's final boss, the black dragon in the game he used to play! Now that he has a clear understanding of the outcome, he must take control of his own destiny. But wait, what is wrong with this little prince who is supposed to take care of him?