남주의 전 여친 역은 사양하겠습니다 (Associated Names)

I was born as the younger sister of the sub-male lead in the 19 tragic romance novel, ‘The Saintess of Erendel’. I had planned to live as quietly as dust, staying out of the tragic obsession story between the original female lead and the male lead, however… At a blind date that my elder brother…