That was not the case when I watched Bakjwi, under the American title Thirst. Now playing at select theaters near you. Seems like the film makers did not want to spare you any details. There WILL be blood in this film and you WILL try to look away.
I have always been a fan of Korean cinema. After all, it did give birth to what may be my favorite film, Sympathy for Lady Vengeance. Thirst, honorably followed that track of fantastic cinema.