I Became the Hidden Mastermind, also known as 숨겨진 흑막이 되었다, is a thrilling novel that delves into ghost tales, curses, and the mysterious world of female students. The story revolves around the protagonist who finds themselves entangled in things that shouldn't obsess them, yet inexplicably become the center of their existence. Written originally in Korean, this novel offers a unique blend of supernatural elements and suspense that will captivate readers from start to finish.