An eccentric billionaire who manipulates his family into living in an underground Compound, viewing them as part of a larger experiment.

Eli’s adopted sister, who seeks material comforts and strives for their father Rex's approval, becoming involved in his experimental plans.

Eli’s sister, who follows routines and expresses skepticism about their father's intentions, often challenging Eli’s perceptions.

A talented cellist and nurturing mother who supports her children’s individuality and opposes her husband's manipulative schemes.

Eli’s twin brother, remembered for his kind nature and charisma, whose absence profoundly affects Eli’s life and sense of self.