After Becoming the Vicious Female Side Character in a Business-War Novel, I Spoiled My Gentle Childhood Friend into a Mogul

Female Supporting Character Stories, No Rebirth Stories!!!!!!!!!!

The female lead transmigrates into a book as a supporting female character and marries a powerful villain. A marriage first, love later. No angst, no angst, no angst. It's important, so I'll say it three times.