Josephine is a 26-year-old golf enthusiast who manages the Golden Tee, her family's long-standing pro shop in Palm Beach, Florida. Having lived with type 1 diabetes since childhood, she fiercely protects her independence and refuses to be treated as fragile. When a severe hurricane damages her beloved pro shop, she accepts an unconventional offer to caddie for her favorite golfer to fund the repairs and maintain her autonomy.

Wells is a 29-year-old professional golfer known equally for his exceptional talent and his notoriously bad attitude. Following a steep decline in his career and facing isolation from those he trusted, he considers quitting the sport entirely. He is rough around the edges and struggles with personal connections, but he offers to employ his biggest fan as his caddie in a desperate attempt to salvage his career.

Evelyn and Jim are Josephine's parents and the long-time owners of the Golden Tee pro shop in Palm Beach. Ever since Josephine's childhood diabetes diagnosis, they have been anxious and highly protective of their only daughter. Though they try to give her space to run the family business, their hovering tendencies often clash with Josephine's need for full independence.

Tallulah is Josephine's closest friend who is currently stationed in Antarctica for research. Despite the physical distance between them, she remains deeply invested in Josephine's life, providing a sounding board and emotional grounding through frequent phone conversations.

Buck is a former professional golfer who discovered a teenage Wells at a local course and trained him for greatness. As Wells's performance and attitude worsened, Buck distanced himself, leaving his former student feeling abandoned by the one father figure he trusted.

Nate is Wells's long-suffering manager who tries to keep the golfer's chaotic professional life in order. He handles sponsorships, media requests, and tour logistics, though his client's volatile temper makes his job incredibly difficult.

Burgess is a professional hockey player and a single father. As one of the few people who tolerates Wells's abrasive personality, he provides a rare outlet for socialization outside the intense golfing world.

Lissa is Burgess Abraham's young daughter who often accompanies her father as he travels for his professional sports commitments.

Buster is a fellow professional golfer on the PGA tour. He serves as an immediate rival to Wells, antagonizing him on the green and openly flirting with Josephine to provoke a reaction from his opponent.