unknown manga

ok guys, I REALLLYYYYYY need ur help. I started a manga a while ago, like a pretty long time ago. I didn't finish this manga though because I lost it. I have no idea where to find it. I even asked Chat-GPT and gave it everything I know but it couldn't help me. Basically, this is a romance fantasy isekai manga. The female lead gets reincarnated into a noble lady's body. This noble lady is known to behave horribly and have a short temper. From what I remember, she had orangeish-pink hair and an older brother with similar features. Here's more info!

• Female Lead: Reincarnated into a body known as an evil/troublesome girl.
• Male Lead: Black hair, purple eyes, refers to his system as the "Dragon's Curse," which imposes penalties if he doesn't follow its directives.
• Plot Point: An old noble turns into a monster during a party.
• Barrier Incident: The female lead, male lead, and another man are trapped in a barrier with the monster.
• System Task: The male lead's system instructs him to kill the female lead, but he refrains.
• Penalty: The female lead fails to complete her task, resulting in a fatal abdominal wound.
• Explanation: While unconscious, the male lead explains the "Dragon's Curse" to the female lead's brother.

im not really sure where I read it, but either webtoon, tapas, bato.to or some other random website. pls helppp I really want to read it all.