I Ended Up Saving the Male Leads Trapped in the Zombie Apocalypse

I’d transmigrated into the body of a noble lady who used to steal supplies and run away in a zombie-themed romance fantasy novel. Even worse, I was the only sister of the main culprit behind the zombie outbreak.
Whether I tried to escape or chose to stay, I was destined to die as a traitor. So, I decided to save the male leads first and earn my pardon…
However.
“At the very least, you could serve as a shield.”
The distrustful #MadDog Crown Prince.
“What makes you think I’d cooperate with you?”
The #Aloof Duke who severed ties with me in the childhood.
“What could you possibly do for me?”
The sharp-tongued #Stern Tower Master.
“I’m sorry, but I don’t think I can accompany you.”
The peace-loving #Gentle Prince of the East.
No one told me they were all so precious gems! Now, on top of managing them, I had to conquer new obstacles.
‘This useless brother of mine!’
I think I’d uncovered a secret that wasn’t revealed in the original novel. Along with a path of endless hardships.