Book Transmigration: Male Lead, Please Step Aside

Zhang Nan transmigrates into a book she has just read. Every male lead and supporting male character is a top-tier male god, but unfortunately, Zhang Nan has become not the heroine but the first supporting female character. The real problem is that this book doesn't follow the usual rules. Thinking about the plot, Zhang Nan figures she might need to burn incense for herself in advance. This is going to end badly. Gradually, Zhang Nan can't help feeling that something about the plot is off. Did she transmigrate into the wrong story?