Lol.
She died shortly after learning she inherited 1 billion from her dead grandfather. Basically wakes up in your run-of-the-mill villainess trying to take the true daughter down to be only daughter since she is so loved by the parents. She made the choice to not follow the story since she wants to live and has set out to fix the relationships around her for the real daughter as well as the family itself to keep it from falling to its demise like in the book.
There's your three sentences, but to add to it from what I saw so far before I go dive into reading the novel. She appears to want to leave the family after fixing all the issues since she is the fake daughter in all essence so that Gu Jin, the real daughter, can take her rightful place. We all know that isn't going to go well, they won't let her run away. ╮(￣▽￣)╭
Thanks for your time
Welp this is going above my head... Can anyone summaries in 3 sentence what happened till now?