Kyle is a recent high school graduate whose plans to attend UCLA and play college football are derailed by a severe sports injury. He is deeply attached to his girlfriend, Kimberly, and his best friend, Sam, viewing the three of them as an inseparable unit. A tragic car accident abruptly alters the trajectory of his life, leaving him to process intense grief and the physical aftermath of a traumatic brain injury.

Marley is a shy, introverted young woman who spends her time at the local cemetery visiting the grave of her twin sister. She has a deep affinity for storytelling and the natural world, often communicating her feelings through the symbolic meaning of flowers. Carrying her own heavy burdens of guilt, she shares an instant understanding with Kyle when they cross paths.

Sam is Kyle's loyal best friend who initially planned to attend UCLA with him before being waitlisted. He serves as a mediating presence in the friend group and deeply cares for both Kyle and Kimberly. Following the car accident, Sam attempts to maintain his bond with a grieving and isolated Kyle while silently carrying his own complex, unspoken emotions.

Kimberly is Kyle's high school girlfriend who plans to attend college in California. Though they appear to be a perfect couple on the outside, she feels stifled by their dynamic and desires to establish an independent identity outside of Kyle's influence. Her decision to pause their relationship on the night of their graduation precedes a life-altering car crash.

Laura is Marley's twin sister who died tragically when they were young teenagers. Her memory heavily influences Marley's present-day life, dictating Marley's daily routines, her profound sorrow, and her tendency to withdraw from the outside world.

Kyle's mother is a supportive and resilient woman who raised Kyle alone after the death of his father. Understanding the deep pain of losing a loved one, she gently but firmly encourages her son to keep looking forward to the future rather than isolating himself in his bedroom.

Dr. Benefield is the medical professional in charge of overseeing Kyle's hospital treatment. He monitors Kyle's brain scans and neurological recovery following the severe car crash, helping explain complex medical realities to his patient.

Scott Miller is a sports reporter for the local Times newspaper who previously covered Kyle's high school football games. He provides Kyle with an opportunity to explore sports journalism as a potential new career path after football is no longer an option.

Marley's mother struggles with the aftermath of losing one of her twin daughters in a tragic accident. The shared trauma has created a difficult barrier between her and her surviving daughter, Marley.

Georgia is a rescue dog that Marley and Kyle pick out together from the local animal shelter. She brings a spark of joy, energy, and responsibility into Marley's quiet life.

Paul is one of Kyle's old high school friends. He participates in casual neighborhood touch football games during the summer months, representing the carefree past Kyle struggles to return to.

Dave is a former high school buddy of Kyle's who remains in the area and continues to play sports with the old friend group.

Dr. Ronson is a hospital psychiatrist who works with patients recovering from severe trauma. He helps patients process their memories and understand how external stimuli affect their ongoing recovery.

Kyle's father died when Kyle was in kindergarten. His early passing profoundly shaped Kyle's mother's resilient outlook on life and her approach to coping with tragedy.

Kimberly's parents are briefly introduced as they manage the devastating aftermath of their daughter's car accident, collecting her personal items from Kyle's home.