A half-human, half-beast wolf

Soon-young, an ordinary high school student, is tricked by the woman she loved and taken to a strange laboratory. There, she is forced to inject herself with a suspicious drug that spreads throughout her body through her blood vessels. After becoming half-human and half-animal, Soon-young is told that if she kills someone she wants, she will be turned back into a human. After that, she ends up going to the same school as the person chosen by the people in the laboratory to kill that person. Soon