Ashley is a university student at Nevaeh University navigating a polyamorous relationship with four wealthy, powerful men connected to the Devil's Backbone Society. After a falling out at a party, she wakes up involuntarily committed to Mallard Psychiatric Hospital, where she must fight to retain her grip on reality. Fiercely loyal, she draws strength from her chosen family to combat the psychological manipulation used against her.

Nate is Ashley's stepbrother who maintains a tense and secretive dynamic with her following a rejected proposition. He struggles with guilt and a conditioned monogamous mindset, making him hesitant to fully integrate into the group's polyamorous relationship. Despite his abrasive exterior and tendency to keep secrets, he possesses a strong protective instinct toward Ashley and acts as her medical power of attorney.

Royce is an emotionally intelligent and playful member of Ashley's polyamorous group. He frequently uses humor to lighten heavy situations and acts as a catalyst for communication among his friends. Beneath his charming demeanor lies a fierce protectiveness over his chosen family, driven in part by his own father's emotional neglect.

Carter is an intensely passionate man who uses his immense financial resources to create a protective bubble around the people he loves. His quick temper and possessive nature often lead him to resort to aggression when Ashley is threatened. He relies heavily on his wealth to solve problems, which occasionally creates friction with Ashley's desire for independence.

Heath is the emotional anchor and voice of reason within Ashley's polyamorous relationship. Having survived severe psychological manipulation in the past, he offers Ashley empathetic understanding and steady comfort during her own trauma. He expresses his affection through consistent, gentle acts of care rather than grand financial gestures or aggressive displays.

Jocelyn is Nate's mother and a scientist operating under the name Dr. Russo at Mallard Psychiatric Hospital. She holds deep-seated grudges against her ex-husband and his new family, channeling her professional ambition into unethical psychological experiments. She uses gaslighting, medication, and hypnosis to manipulate her patients, showing no remorse for the damage she causes.

Carly is Ashley's fiercely loyal best friend who provides practical solutions and a connection to normal university life. She is one of the first to suspect that the text messages sent from Ashley's phone are fraudulent. Carly maintains an active romantic life with multiple partners of her own and consistently prioritizes her friendship with Ashley.

Abigail is a patient at Mallard Psychiatric Hospital whose diary previously guided Ashley's understanding of the Devil's Backbone Society. Initially believed to be dead, she is found at the facility and provides Ashley with a crucial clue about the reality of her involuntary commitment.

Carina is Ashley's mother, who recently remarried into the wealthy Essex family. She is deeply concerned for her daughter's well-being and briefly considers sending Ashley to a secure facility in Switzerland for protection, unaware of the trauma Ashley is experiencing at Mallard. She remains a loving figure targeted by Jocelyn's vindictive jealousy.

Max is Nate's father and Carina's husband. He carries lingering guilt over his past marriage to Jocelyn, acknowledging her history of mental instability. He acts as a supportive stepfather to Ashley and attempts to use his influence and resources to protect his blended family from external threats.

Colonel Mike is Royce's emotionally distant father, possessing high-level military connections. He is rigid and condescending toward the younger generation, often dismissing their accounts of trauma and danger. His focus on protocol and lack of emotional warmth create significant tension in his relationship with his son.

Nurse Annette is a staff member at Mallard Psychiatric Hospital who grows suspicious of the facility's operations. Demonstrating sympathy for Ashley's plight, she takes a significant professional risk to contact Ashley's listed medical power of attorney, providing a crucial lifeline to the outside world.

Henry is Royce's uncle and a well-connected lawyer who monitors the activities of the Devil's Backbone Society. He provides the group with critical updates regarding legal proceedings and arrests, maintaining a warmer dynamic with Royce than the Colonel does.

Edmund, often called Ed, is one of Carly's boyfriends. He attends university events and is aware of Carly's other romantic partners, participating in the social activities surrounding the Devil's Backbone Society.

Spencer is Carly's other boyfriend. His presence occasionally causes friction with Edmund, though he remains part of Carly's active romantic life.

Paige is Nate's ex-girlfriend who continues to contact him regarding her own family problems. Her lingering presence causes moments of insecurity for Ashley.

Jade is a university student who aggressively pursues Carter. She attempts to sabotage Ashley's relationships out of jealousy, using gossip to create tension among the group.