Transmigrating Into a novel as a Rich Second-Generation.

After death, Sebastian transmigrated into an urban novel as a wealthy young master. Unfortunately, he only enjoys his new luxurious life for a few days before the poorest student in his high school begins to show signs of being a protagonist. Realizing he's been cast as the villain destined to be destroyed by chapter 87, Sebastian awakens the Villain Counterattack System. Now he must steal the protagonist's opportunities, win over the heroines, and rewrite his doomed fate before it's too late. — Description from novelcodex.org