Quick Transmigration: The Beautiful Cannon Fodder Faked Death After Derailing the Plot

Summary
Lu Jin’an was an amnesiac wandering through the interstellar void. Aside from his exceptional appearance, he possessed no notable skills. To regain his memories, he entered into an agreement with a System to play the role of “cannon fodder” in various worlds—minor characters destined to stir up trouble and meet a miserable end.
In one world, he was cast as a malicious supporting character suffering from a heart condition. He simultaneously loathed his younger brother (the protagonist) and coveted the boy’s healthy heart. He bullied the displaced main lead and severed ties with his childhood friend—the future villain—the moment the latter fell into poverty.
Having committed these misdeeds, Lu Jin’an retreated into a corner, waiting for his scripted demise.
However—
The brother whose heart he had targeted carefully pulled him into an embrace. “Brother, please stop crying. Is your heart bothering you?”
The bullied main lead watched through the hospital window like a devoted follower. “Young Master, you cannot let anything happen to you. I still have a debt to settle with you…”
The abandoned childhood friend grabbed him by the collar, his voice raspy. “Princess, don’t delete me from your life this time.”
Lu Jin’an, who was fully prepared for his exit: “???”
Character Dynamics:
An emotionally dense, beautiful protagonist vs. an obsessive, self-jealous, fragmented antagonist.
A story focused on a beloved, stunning protagonist. (Specific worlds to be determined.)