Blood Mate.

Soo-hyun is just your average college student whose life is turned upside down when she finds out that her classmate, Ji-hoon, is actually a vampire. Ji-hoon insists that he would never hurt humans, but a series of mysterious events cause Soo-hyun to doubt him. Soon, Soo-hyun becomes caught up in the world of vampires, oblivious to the danger she's in...