A bullied high school student named Shu-Wei becomes entangled with a group of delinquent classmates who frequently torment him. As part of a class project, they are forced to work together and stumble upon a pair of flesh-eating ghouls in an abandoned building. Captivated by the discovery and seeing an opportunity for thrills, the group captures one of the ghouls, chaining it up in their secret hideout. They start to subject the creature to a series of sadistic experiments and abuses, observing its regenerative abilities with a mix of fear and fascination.

While Shu-Wei initially stands by, his participation in the group's cruel actions slowly escalates, driven by a desire to fit in and stop being their victim. However, as he gets further involved, he begins to wrestle with his conscience and the growing horror of their actions. The remaining ghoul sibling seeks to rescue its captured counterpart, leading to increasingly tense and violent encounters.