My Sister's Happy Ending summary: Yoon Bom-bit loves one thing above all else – dating simulation games. Her most recent obsession? A feudal-era game called “The Lonely Hawk Sings in the Absinthe-Colored Cage” starring Anette De Valois. Bom-bit would do anything to give Anette the happy ending she deserves…but her plans are consistently ruined by Mariette: Anette’s twisted stepsister who leads Bom-bit to getting a bad ending over and over again. One day, Bom-bit starts her computer up, only to be transported into the world of the game – and inside Mariette’s body! With this newfound chance, will Bom-bit be able to help Anette finally get the happy ending of her dreams?