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!

on her birthday Catherine recalled the memories of her past life thanks to being hit by a door. the next day she'd learned that she was reincarnated as the villainess of a manga she once read, destined to have a destruction end. catherine thought 'what to do?' then suddenly an idea came up she will become a cupid villain, she will bully the heroine and make all villains in the world cry in shame on her greatness! she will help the heroine to have a happy ending with the male protagonist while she slowly laid her safety nets to ensure that her family and her will not fall into ruin. what a perfect plan!!!