Edison Junior High has always had a perfect teaching image and a well-known reputation, but it also has a highly mysterious campus legend. Students with bad grades who enter Dorm 420 all improve their grades in leaps and bounds if they happen to make it back out alive. Yeh Chun, a gifted student who has just transferred here, sneers at such legends, and is even more surprised by the stressful atmosphere and distorted system in the school. He simply wants to change the status quo, but he does not know that a treacherous storm is brewing.