I Became the Older Sister of a Regretful Male Lead

As the male lead's older sister, Edna Luschen Demirette is destined to die from the void virus, a dangerous disease with no cure. Fortunately, Edna discovers that the virus can be purified by touching Prince Carlen, a poor outcast with divine powers. But as simple as that sounds, Edna's plans to befriend him go awry when he mistakes her for an obsessive fan during their first meeting. Armed with nothing but her sharp wits, will Edna successfully persuade the cold prince and save herself?