Geu Gongjakgaeneun Goemuri Salgo Itda

Freesia, who has been harassed by others due to her red eyes, has been wanting to confess her love on her birthday to Ben, the benefactor who saved her. But on the eve of her birthday, she runs into the red-eyed Ben who drinks blood in the woods... and finds out that his true identity - a vampire?!

(Source: KakaoPage, translated)