The Seventh Prince Escapes His Uncertain Fate

A brief description of the manhwa The Seventh Prince Escapes His Uncertain Fate:
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.