Main •
Ok Taec-yeon as Seon Woo-hyul: a half-human and half-vampire who had failed to become human due to a one-day difference in 100 years. •
Won Ji-an as Joo In-hae: a part-time high school nurse and owner of a guesthouse. •
Yoon So-hee as Yoon Hae-seon / Na Hae-won • Yoon Hae-seon: a member of an aristocratic family during the
Joseon period. Woo-hyul's first love. • Na Hae-won: a real estate investor.
Supporting Vampires around Woo-hyul • Yoon Byung-hee as Lee Sang-hae: a vampire and a tarot master. •
Ko Kyu-pil as Park Dong-seop: a self-employed vampire who runs a snack bar in front of a high school. • Seung-you as Rose: a vampire and a dancer who has a bright and positive personality.
People in the neighborhood •
Baek Hyun-joo as Go Ki-suk: a local butcher who runs a butcher shop near Woo-hyul's mansion. • Jung Young-ki as Kim Gwang-ok: owner of a tailor shop. • Seo Hyun-cheol as Joo Dong-il: In-hae's father. •
Park Chul-min as Butler Joo: first generation of a butler family. • Kim Hyun-joon as a fraudster • Seo Jun as Hyang-geun • Jang Seo-yeon as Hwang So-yi: the first guest at In-hae's guesthouse. == Music ==