Their happiness is my happiness—No one beats my fave!!!! Lize, a potion maker who was an extreme fangirl in her previous life, discovers one day that she’s been reincarnated into the world of an otome game! She finds her ultimate favorite character, Mea, the son of a duke, collapsed on the street—and quickly realizes he doesn’t look happy at all. While nursing him back to health, she makes a vow: “I’m going to make Lord Mea the happiest person in the world!!” Thus begins an unexpected cohabitation with her beloved… but he's just too precious, and her heart can't take it! To make things even more intense, somehow she, a mere mob character, ends up becoming his temporary fiancée?! This is a fangirl’s full-throttle romantic comedy, where she showers her favorite with love and admiration—only to find herself being completely captivated by him in return!