After Transmigrating Into a Book, I Only Wanted to Keep My Head Down, Yet Became Empress

【Transmigrate into a Book + No Romance + Strong Female Lead + System】 The moment I transmigrated into a book as the chancellor’s daughter, I was ordered to poison the empress. Refuse? The System said, “If you don’t do bad things, your power will run out, and you’ll turn to ash.” Fine, then I’ll be bad enough to make you regret it. But can someone tell me what’s going on with that reborn supporting character who’s out for revenge?! Later, I discovered I wasn’t the only one who had transmigrated into this book... The System’s real goal was to make the characters in the book “awaken.” And me? I just wanted to stay alive. So how did simply lying low end with me becoming empress?