The [Redacted] Male Second Lead Came Out of the Book

Ji Man is the quintessential second male lead in a romance novel: poor grades, great fighting skills, and devoted, single-minded love for the heroine. One day, though, Ji Man steps out of the book and becomes the frail young master of the Ji family, with excellent grades. This is the story of a school bully second male lead who steps out of a book and gets bent.