I Got Killed and Woke Up as a Successor

That guy was my friend's boyfriend. After they fought, he came home and said he wanted my opinion. What exactly made his girlfriend change? I, who didn't have a bad feeling at all, put him in the house. Then he killed me!
That bastard stabbed me multiple times with a kitchen knife and killed me. Even though he knew tomorrow was my wedding day.
How sad. A death that made me curse all efforts. But, what could I do?
I thought I was dead. I did. Because at that moment I didn't feel any air in my lungs. Because everything went dark.
I didn't know anything until I opened my eyes and saw a beautiful ceiling with crystal chandeliers. Are there hospitals like this? I'm sure that even if the apartment I lived in was sold, I wouldn't be able to buy that crystal chandelier!
"She's alive! SHE'S ALIVE! LADY ELEONORA IS ALIVE!" I turned my head and saw an old woman running while screaming.
I'm alive? Really? But who is Eleonora? I'm Cristy!
I don't understand anything yet. Not a single thing. People started introducing themselves as my parents, future in-laws, and fiancé. But I knew that none of them were telling the truth!
Their smiling faces were terrifying masks. My gut screamed at me to run away.
And I knew that my gut never lied!