My Possession Became a Ghost Story

She transmigrated into a romance fantasy novel, but there's a problem—she woke up inside a coffin on the day of the original body's funeral. To make matters worse, she can't identify which novel she's in because she's read too many. Seeing how cold her family is and how terrified the maids are, she realizes she must have possessed a villainess. Time to use her romance fantasy expertise to escape the villainess route! But then she discovers a strange, ominous pattern that suggests things are far more terrifying than she imagined...