When Kai Lunao was on his way back home from school, he picked up a mysterious BL book titled, "The Gold Knight." Shortly after reading the book, he died from a fire. Shockingly he transmigrates into the book! Kai reincarnates as the hero's childhood best friend who was destined to be left behind by the hero of the book. His fate was to fall into an unrequited love with the hero who was the protagonist of the book. However, Kai adores the Villain! Kai does not want to fall in love with the hero, instead, he wants to pursue the Villain!