Vampire-ui Kkot

In a world where humans and vampires struggle to coexist, Seoyoung is just trying to live a peaceful life, spending time with her high school friends and working part-time at the flower shop. But that all changes when she crosses paths with Louie, an ancient and powerful vampire who needs her help hunting down the mystical "Vampire Flower" before it falls into the wrong hands. Suddenly thrown into a deadly battle between humans and monsters, Seoyoung will begin to unravel long-hidden secrets and sinister schemes as she tries to help Louie find what he’s been looking for all along...

(Source: Tappytoon)

Note: The chapter count includes a prologue.