Broketaku

Hi! I'm trying to find a comic that I read a few months ago. It's about a female writer who gets dragged into the world of her own book by the villain. The villain has short red hair and has a butler with silver hair. The writer can write something in a book, which then happens in that world, like giving her super speed. Something that happened is the villain losing in a horse race against his brother, they're both princes. Pls help! :)