The Novel's Extra (2022) follows Kim Hajin, a former special forces agent who wakes up one day as an extra character in a web novel he wrote in his past life. He is trapped in the body of a minor, expendable villain in the story of the hero, a world where the protagonist is destined to succeed thanks to a perfect supporting cast. Armed with his knowledge of the plot and a mysterious ability to rewrite parts of the story using a "coincidence maker," Hajin must survive and carve out his own path. Instead of trying to become the hero, he uses his wits, martial skills, and modern firearms to manipulate events from the shadows, protect the heroine he admires, and gain power and wealth. Readers enjoy the story for its clever twist on usual isekai and transmigration tropes, where the main character is underpowered in a world of magic and superhumans but uses strategy and insider knowledge to outsmart fate. The mix of action, comedy, and moments of heartfelt character development, along with the satisfying payoff of an underdog using mundane tools like a pistol against godlike enemies, keeps the narrative thrilling and addictive.