One day, in 1998, a lab fire broke out in the Home Economics room, resulting in the death of Seong-ah, a very close friend of Na-yeong (So-yeong's older sister). One spirit, the 'Master of the Labyrinth' could not stand being unable to escape the school's hold and sought a way to escape it. This was kept a secret from that day onwards.

However, it also locked all the spirits inside the school and prevented them from going to the afterlife. A geomancer was brought in to construct 5 amulets representing the five elements (Wu Xing), who spread them around the school to balance feng shui and to prevent the spirits from interfering with the living. Many visitors and builders died during the building's construction which awakened the power (Qi) from the imbalance of feng shui and the ghosts from the hospital's past. The school was a hospital during the Korean War. It is said that the area used to be a perfect natural landscape before it was built. Yeondu High School's construction unbalanced feng shui around the area.

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