Transmigration: I Made A Deal With A Man in Yellow

Idal was an ordinary author whose greatest regret was never being able to repay his parents for everything they sacrificed for him. One day, after making a mysterious deal with a strange man dressed in yellow, he transmigrates into the world of his own novel. However, things are not as he remembers. Instead of possessing the body of his protagonist, Idal awakens as Yves Noctis Laurent, a character he has no memory of creating. Armed with knowledge of the future and a mysterious system similar to the one possessed by the original protagonist, Idal must navigate a world that no longer follows the story he wrote. To survive, uncover the truth behind his transmigration, and find a way home, he must first rise from the position of a useless noble son to someone capable of changing the fate of the world itself. ... — Description from novelcodex.org