After I Left, My Family and Fiancé Regretted Choosing My Sister Over MeEpisode 15

Elena has always been the invisible daughter. When her sister Viola finally passes an exam, her family throws a grand party—and makes Elena greet guests. No one knows Elena has been accepted into a top secret research program and will leave in three days. After her sister throws away her admission papers, Elena cuts ties and walks away. Years later, she returns successful, refusing their apologies and choosing her own future.