In-Soo (Kang Ha-Neul) has a special gift to see ghosts and has become isolated from other students because of this. He transfers to a high school in a rural area outside of Seoul. There, In-Soo meets a female ghost (Kim So-Eun) at the high school and forms a friendship with her. Meanwhile, classmates disappear one by one.

An ordinary businessman in his forties, JANG Ga-pil returns home one day to find his daughter sexually molested by some schoolboys, including school boxing star KANG Tae-wook. Realizing that he has no background and money to fight back, he plans to stab KANG on the way to school. This fails miserably, but another student named GO Seung-suk agrees to teach Ga-pil to fight ? in only 45 days.