A homeroom teacher held 29 students hostage as vengeance for the mysterious death of their roommate. Their act takes a toll on life and sorrow. This bloodthirsty lesson brings up the raw characters of human beings.

A person dies twice in life: The first is when their body perishes, and the second is when they fade from the memories of others

Identical twins Sprite and Zee, groomed as athletes from birth, share an unbreakable bond yet compete fiercely to be the best, each determined to outshine the other.

Five senior university students are invited to an old elite mansion by a professor, where she terrifies them and reveals her demonic power before making a decision.