The Terminally ill Rejects The Strategy

I found myself possessing an extra in a novel. I even received a marriage proposal from the main character. I thought I had twisted the original story. That was until I discovered my fiancé was “targeting” other women.
[Target is upset. Please soothe ‘s troubled heart ⸜(♡’ᗜ’♡)⸝
1. Give her a peck.
2. Share a kiss.
3. Head to the bedroom.]
Suddenly, I realized as I looked at the system window that this place was a notorious, poorly-made game based on the original story, and I had been the one getting played by the “player.”
“Oh dear, Clara. My lovely little bird. Why do you look so upset?”
The male lead said in a sleazy tone, facing the woman.
[SYSTEM] You have selected “3. Head to the bedroom”…
And that was the moment my fist slammed into that filthy mouth.
Bam!
The sparkling system window above me shattered into pieces. Along with that jerk’s teeth.
* * *
[Attribute: Terminally Ill (Remaining lifespan: 13 days, 11 hours, 47 minutes)]
I was both a target for the “player” and a sacrifice to help with their awakening. A man appeared before me, someone who seemed to be my way out of this cursed terminal illness. The prince from the neighboring country, known as the “mu*derous Madman.” For short, let’s call him “Mad Prince.”
[Bug detected!]
[Bug detected!]
He whispered in a gentle voice, “Don’t doubt my love. If you keep doubting, it’ll hurt my heart.”
Despite his sorrowful gaze, there was a fierce glint in his eyes that sent chills down my spine.
“It feels like my heart is being torn apart.”
As if he would tear me apart himself.
…It’s already tough being terminally ill, but now this “Mad Prince” is starting to obsess over my frail life.