Tiernan is a 17-year-old orphan who travels to the snowy Colorado mountains to live with her estranged step-uncle. Raised largely by household staff and neglected by her famous parents, she struggles with night terrors and often represses her emotions. She possesses a naturally competitive streak and finds herself drawn to the harsh mountain environment as she seeks a sense of belonging.

Jake is a self-made entrepreneur covered in tattoos who runs Van der Berg Extreme out of a secluded mountain ranch. He is the step-brother of Tiernan's late father but holds a deep-seated grudge against his estranged family due to events in their youth. As a single father, he is fiercely protective of his wild sons and wrestles with his complicated boundary-pushing reactions to Tiernan's arrival.

Kaleb is Jake's 22-year-old son, a muscular man who has not spoken a single word since experiencing severe childhood trauma. He communicates through raw physicality and intense silent observation. He possesses a deep kinship with animals and the rugged mountain environment, functioning as an unpredictable force in the household.

Noah is Jake's 20-year-old son, an expert dirt bike racer who is more easygoing and communicative than his father and brother. Despite his playful attitude, he feels stifled by the isolation of the mountains and his father's control, longing to join the professional racing circuit. He often uses dark humor to diffuse the heavy household tension.

Terrance is a wealthy Motocross racer and a rising star on the local off-road circuit. He is arrogant and dangerous, representing a sinister threat disguised by his put-together appearance. He harbors jealousy toward the Van der Berg family's business and views Tiernan as a prize to be exploited.

Mirai is the live-in housekeeper for the de Haas family in Los Angeles. Kind and perceptive, she essentially raised Tiernan due to her parents' extreme neglect. She serves as Tiernan's main source of stability and moral support, actively checking in on her well-being while she adapts to the unfamiliar Colorado ranch.

Hannes was a celebrated novelist and scriptwriter in Los Angeles. He was deeply neglectful of his daughter and entirely self-absorbed in his relationship with his wife, Amelia. His past betrayals caused a permanent rift with his step-brother Jake.

Amelia was an Oscar-nominated actress who prioritized her career and her husband over her child. Vain and dismissive, she provided Tiernan with cynical advice about love but failed to provide any actual maternal warmth.

Cici is a young local woman in the Chapel's Peak area who hangs around the Van der Berg men. She frequently tries to gain Kaleb's attention despite his cold dismissals of her advances.

Flora was a poor Mexican immigrant who worked at the de Haas family vineyard when Jake was young. She was Jake's first true love before cruel manipulations drove her away, leading to a tragic end that permanently shaped Jake's worldview.