Dajeonghan Jipchang Namjuege Sarojapimyeon

Roznia Hill is the younger sister of the Magic Tower Master, the villain of "The Duke's Only Companion." Knowing that the male lead will kill them both in the future, she tries her best to stay out of trouble. But one day, Roznia finds a man collapsed at her doorstep... It's Duke Lewellyn Rasiane, the male lead she's been trying to avoid! But to her surprise, he soon starts showering her with sweet words and affection, which leaves Roznia torn—is his love genuine, or does he have another motive?
(Source: Tapas)