The Seventh Prince Wants to Bail

At the end of a grueling day, I was transmigrated into the fantasy novel Dark Heather with sudden agony! But… of all people, I’m the notorious 7th Prince, destined for a miserable execution three years from now?! From now on, I have only one goal: to live in hiding until the original protagonist appears, then quietly escape the Empire. However, the events of the original story erupt sooner than expected, and a secret operation to 'clean up' begins, moving between the Imperial Palace and the back alleys.