Silsuro Namjuui Dongsaengeul Kkosyeobeoryeotda

A woman who works in an office is reborn into a romantasy novel as its villainess character, Elena. Knowing the fate that awaits her in the story, she refuses the main male character's proposal to be his lover, believing this will keep her from harm. However, she soon realizes she has unknowingly cast a charm on the male lead's younger brother.