Surviving as an Illegitimate Princess

Synopsis

"Don't look down on me just because I'm young! Even though I look like this, I’m on my 10th life!" I'm an illegitimate princess whose life was cut short after being mistaken as kin of an enemy country. Later, I discovered the identity of my biological father in my 9th tragic regression. It was Paeon, a war hero who defeated the demon king and the strongest holy knight in the continent. He had a forbidden relationship with the princess, had me, and then deserted me! In order to survive the harsh royal palace, I've decided to use and then abandon this impudent father. I will become the strongest as fast as I can and escape from this disgusting country! And so, while I was building my strength, I happened to meet the demon king's son, Leo. He wasn't arrogant like his father, but he was pitifully living in captivity. So, I took care of him in secret. A father and holy knight who had (?) a forbidden love. Along with an enemy prince who is trying (!) to have a forbidden love. With them, can the unfortunate princess change her fate? (Source: KakaoPage, translated)