I Took the Main Character's Sister at the Start, Now the Heroine is Full of Regret?

Ning Bei transmigrates into a novel as the cannon-fodder villain who’s destined to be milked dry by the “Child of Destiny,” lose his family fortune, and die a dog’s death.

Lucky for him, the moment he arrives, the “Life Reversal System” boots up and the plot derails spectacularly.

The protagonist’s little sister goes berserk?

Before the hero can rush in to save her, Ning Bei is already there, smirking: “Remember, you begged me for this.”
Protagonist’s Sister: “Y-Yes, I begged you…”

The two-faced fiancée wants to break off the engagement to threaten him?
Ning Bei goes public at once: “You all heard her, she asked for it, and I accept.”
The fiancée instantly panics.

The Ning Bei who used to dote on her to the bone and worship the ground she walked on… actually agreed?

“Brother Bei, I forgive you, okay? Let’s start over?”
“Why won’t you even look at me? I was wrong, all right?”
“Ning Bei, tell me this is a lie, you said you’d never marry anyone but me!”

Sorry. Ning Bei never looks back. The farther away, the better.

The heroine finally wakes up: she must’ve been brain-dead to think the novel’s protagonist was better than Ning Bei. Ning Bei is the best man under heaven!

She tries to win him back, only to see the protagonist’s sister holding her swollen belly: “This child is Ning Bei’s. Please stay away from my man. Oh, and… thanks for handing him over to me.”
“No!!!” The heroine collapses in tears.

The Child of Destiny himself is driven to despair:
“Monster! I only tried to steal his connections, and now my own sister’s carrying his baby!”

Years later, Ning Bei stands invincible over the world.
The original protagonist can only wail, “I’ve spent my entire life living in his shadow…”