HELP ME FIND THIS MANHWA

Hi, I'm looking for a manhwa with these specific details:

Main Character: A girl (?) with black/dark hair and a tiny/small body.
Plot: She is mentioned as the first S-Class (or SS/SSS) Hunter in Korea. Other countries already had them, and her appearance causes a huge sensation.
Key Scene: There is a scene where her rank is revealed on a giant billboard/screen in the city, shocking the public.

Does anyone know the title? Thanks!