Noah is an 18-year-old student preparing to attend the University of California, Los Angeles. She carries physical and emotional scars from her deceased, abusive father, leading to severe nightmares and post-traumatic stress disorder. She loves her stepbrother Nick intensely but increasingly struggles to maintain her own identity and independence against his protective, controlling tendencies.

Nick is a 22-year-old law student working at his family's company, Leister Enterprises. Beneath his polished corporate exterior lies a history of street racing and physical fights. He is intensely protective of his stepsister and girlfriend, Noah, a trait driven by a deep-seated fear of abandonment rooted in his mother's desertion during his childhood.

Raffaella is Noah's mother and William's wife. A survivor of an abusive marriage to Noah's father, she is fiercely protective of her daughter and deeply wary of Noah's intense dependency on Nick. She actively orchestrates plans, such as a month-long trip to Europe, to forcefully separate the young couple.

William is Nick's father, Noah's stepfather, and a wealthy lawyer who heads Leister Enterprises. He is an authoritative and controlling patriarch who prioritizes his family's public image and business reputation over his son's emotional well-being. He strongly disapproves of Nick and Noah's romance, viewing it as a public scandal.

Jenna is Noah's loyal and pragmatic best friend. Raised in a wealthy environment, she moves through their elite social circle with confidence and ease. She offers blunt advice and unwavering support to Noah, frequently acting as a stabilizing presence when Noah's romance becomes overwhelming.

Lion is Nick's best friend and Jenna's long-term boyfriend. He is deeply loyal but struggles with severe financial pressure and responsibilities tied to his incarcerated brother, Luke. His desperation for money tempts him back into the dangerous world of illegal activities and street racing.

Anabel is Nick's estranged mother, whose abandonment during his childhood left him with severe emotional scars. She periodically attempts to re-enter her son's life, using aggressive and manipulative tactics to force interactions despite Nick's hostile rejections.

Briar is a college student who rooms with Noah at the university. She projects a cynical, rebellious attitude and openly shares her history of mental health struggles, including past self-harm. She quickly forms a bond with Noah, offering her a distinctly different outlook on coping with personal pain.

Sophia is an ambitious, professional intern at Leister Enterprises and the daughter of Senator Riston Aiken. She represents the sophisticated corporate world Nick's father expects him to join. Her close working relationship with Nick quickly becomes a major source of tension and insecurity for Noah.

Michael is a psychologist working at the UCLA campus. He is calm and professional when in his therapeutic role, stepping in to offer Noah a safe space to discuss her anxieties and trauma as she manages her turbulent personal life.

Madison is Nick's younger sister who resides in Las Vegas. She shares a warm, affectionate bond with her older brother, providing him with rare moments of genuine joy and uncomplicated familial connection away from the pressures of Los Angeles.

Charlie is a college classmate of Noah's at the University of California, Los Angeles, and the brother of the campus psychologist, Michael. He is part of the college social scene that Noah begins to explore as she attempts to assert her independence.

Luke is Lion's brother who is currently incarcerated. His impending release and the financial burdens associated with his situation create immense pressure on Lion, indirectly impacting the broader friend group as Lion resorts to illegal activities to secure funds.