Laurie is a young woman in her twenties living in London, working at a hotel while hoping to secure a job in magazine publishing. She is shy, reserved, and fiercely loyal to her loved ones. Her life takes an unexpected turn when she locks eyes with a stranger at a bus stop, sparking an intense attraction she struggles to forget.

Jack is an ambitious young man aiming for a career in radio journalism. He is self-conscious and deeply cares about being perceived as a good person by others. After losing his father at a young age, he values stability and connection. He finds himself awkwardly situated when he begins dating Sarah, initially unaware of the impact he has already made on her best friend.

Sarah is Laurie's gregarious, confident, and beautiful roommate and best friend since university. She knows how to go after what she wants in both her career and her love life. Unaware of the silent connection between her best friend and her new boyfriend, Sarah enthusiastically integrates Jack into their daily routines.

Oscar is a young, wealthy banker from London who comes from a complex family background. He possesses a lighthearted and spontaneous spirit that contrasts with the rainy routine of England. He provides a sense of fun and solid companionship when he encounters Laurie abroad.

Billy is a lively, fitness-focused friend of Jack's. He has a less serious demeanor than his close friend and enjoys socializing, flirting, and playful competition. He quickly brings a fun energy to group outings.

Laurie's father lives a quiet life in the English countryside with his wife. He models a grounded, loving marriage for his daughter, though his declining health introduces deep anxiety into her life.

Laurie's mother is a caring and sometimes anxious parent living in the suburbs. She shares a highly devoted marriage with her husband and eagerly anticipates her daughter's visits home.

Ginny is Laurie's younger sister who passed away at a young age. Her absence leaves a profound emotional gap in the family, shaping Laurie's cautious approach to life and her deep reliance on close friends.

Lucille is Oscar's mother, presenting a highly formal and critical demeanor. She holds strict expectations for her family and carefully observes those who enter her son's life, often acting unwelcoming to outsiders.

Gerry is Oscar's brother. He displays a kind and approachable attitude during family gatherings, acting as a supportive presence in contrast to other family members.

Fliss is Gerry's wife and Oscar's sister-in-law. She possesses a somewhat difficult and demanding personality during social events, making it hard for hosts to please her.

Luke enters the social circle unexpectedly through a chance communication. He gradually becomes a positive presence in Sarah's life as time progresses.

Verity is a woman Jack dates after relocating to Edinburgh. She has a strong personality and is quick to voice her opinions and suspicions regarding Jack's established friendships.

Amanda is a beautiful actress who enters Jack's life during his time in Edinburgh. She seeks commitment and closely watches his lingering ties to his past.

Cressida is Oscar's ex-girlfriend who remains active in his professional and social spheres. Her ongoing presence creates friction and unspoken tension during social events.

Jack's father passed away when Jack was young. His memory continues to influence Jack, particularly through the locations he shared with his family and the strong desire for stability he instilled in his son.

Thomas is Laurie's young nephew. Family gatherings for his birthday bring Laurie back to her childhood home and serve as milestones in the family's changing dynamics.