I Became the Dying Heroine's Little Sister

Title auto-translated

Also known as I Became the Dying Female Lead's Sister · 시한부 여주의 동생이 되었다 · Sihanbu Yeojuui Dongsaengi Doeeotda · I Became the Sister of the Time-Limited Heroine · I Became the Younger Sister of a Dying Woman · 余命わずかなヒロインの妹になりました

Story by Daon Creative (다온크리에이티브), Jwittong Saetton · Art by Kwon Taehan

Synopsis

One day, out of nowhere, she finds herself reborn as the twin sister of her favorite terminally ill heroine from a novel. Since she's already been transported into this world, she decides to go one step further — marrying the story's villain in her beloved character's place. But this fearsome man who is said to be a ruthless killer starts turning beet-red and flustered at her every offhand compliment. Why is someone with such a terrifying reputation so unbearably adorable — and why does he have to be so impossibly handsome on top of it? What began as a scheme to protect the character she loves is slowly becoming something else entirely. Could she actually be falling for him for real?