This Time I'll Change My Husband

"I have found someone I love. So please break off your engagement, young lady."
"Huh? Your real name is..."

One day, I entered the novel "River of Forgetting" and lived quietly as a duke's daughter. I discovered that my fiancé was an ordinary person who was a main character. According to the original work, his love interest is a female protagonist and a saint, and I was engaged to a male lead... A supporting character is destined to be assassinated without the knowledge of any mouse or bird, right?

That night, I learned two shocking truths and confessed them to a man who was drunkenly passing by. I thought he looked like my favorite shady character in this novel, the crown prince of Hyperion, Saul Lucius...

"Do you want to get engaged? Marriage or dating? An affair is fine..."
"Whatever."

This man was Hyperion. As a result, the engagement with the crown prince went smoothly... But my fiancé who dumped me has become obsessed with me. Does anyone know why he's like this...? Or rather, I'm engaged to a crown prince? Is that too much for a supporting role? Well, it seems like the real lead of this novel is different!

(Source: Kakao Entertainment Corp., translated)