The Protagonist's Seat is in Danger

I, who had never been a protagonist in my life, possessed the main character 'Hart' from the orthodox fantasy novel 'Hart's Chronicles'. 'If I just follow the ending where he rises from a count's illegitimate child to the emperor's throne, won't I be able to return to reality?' I decided to avoid what could be avoided but humbly accept major events. That's what I resolved, but... Right after avoiding the crown prince in my childhood, things started going terribly wrong. Not only was I appointed as Crown Prince Adelkar's personal guard knight instead of a royal knight, but Adelkar, who was supposed to be my enemy in the original work, started showing favor and heading toward the friend ro...