Anna is a 25-year-old aspiring artist who works multiple minimum-wage jobs to pay for her father's cancer treatments. Following her graduation, she assumes her college marriage of convenience to Liam is long dissolved. She is shocked to discover she is still legally bound to him and agrees to maintain the illusion of their relationship at a luxurious family destination wedding for a large sum of money. She is highly practical and bluntly honest, carrying a fierce independence that puts her at odds with the excessive wealth of the Weston family.

Liam is a Stanford professor of economics and cultural anthropology who actively distances himself from his family's massive corporate grocery fortune. Years ago, he married Anna to secure low-cost family housing at college. Facing a strict deadline to fulfill a clause in his grandfather's will, he must convince his highly critical family that his marriage is genuine to save his siblings' inheritances. He is highly responsible and deeply protective of his loved ones.

Ray is the CEO of Weston Foods and the domineering patriarch of the Weston family. He is immensely wealthy and uses his fortune to force his children into submission. He views Liam's departure from the company as a personal insult and actively seeks to coerce his son back into the corporate hierarchy. He is aggressively controlling and financially manipulative.

Janet is Liam's mother, a wealthy socialite who obsessively maintains the appearance of perfection. She is highly critical of Anna's pink hair and lack of elite polish, frequently using cutting remarks to assert dominance over newcomers. Beneath her harsh exterior, she harbors defensive instincts toward Liam.

Alex is Liam's older brother who desperately covets the CEO position at Weston Foods. Ray’s toxic parenting style has conditioned Alex to view Liam as a direct threat, fueling his deep insecurity and highly competitive nature. He quickly suspects that Anna and Liam are hiding something about their marriage.

David is Anna's father and a blue-collar mechanic who raised her alone after his wife abandoned the family. He suffers from leukemia brought on by earlier cancer treatments, leaving him heavily in debt due to inadequate medical insurance. His quiet support provides Anna with emotional grounding and serves as a direct contrast to the toxic parenting of the Weston family.

Jake is the youngest Weston brother and the only family member who initially knows the true origins of Liam and Anna’s marriage. He uses charm and humor to deflect his father's attention, preferring to stay out of the direct line of fire between Ray, Alex, and Liam.

Known as Charlie, she is the only sister in the Weston family. Her destination wedding on a private island in Indonesia serves as the gathering point for the entire family. She is deeply sheltered by the family's wealth and remains generally oblivious to the darker undercurrents of her father's manipulations.

Blaire is Alex's wife and the mother of their four children. She copes with the stressful Weston family dynamics through dark humor and alcohol, quickly taking a liking to Anna as a fellow outsider who married into the demanding dynasty.

Reagan is Alex and Blaire's pre-teen daughter. She struggles with feelings of isolation despite her family's extreme wealth, finding an unexpected source of comfort and validation when Anna treats her with genuine respect and attention.

Vivi is Anna's fiercely supportive best friend. She helps Anna process the sudden reappearance of Liam and takes charge of organizing the luxurious wardrobe required for the private island trip.

Ricky is the teenage son of the convenience store owners who abuses his managerial power. After Anna rejects his romantic advances, he scrutinizes hours of security footage to fire her over taking a pack of gum.

Ellis is an editor for Forbes magazine attending the destination wedding. Ray attempts to use his presence to publicly force Liam into committing to a corporate takeover, heightening the tension between father and son.

Kellan is Charlotte's fiancé, whose wedding brings the Weston family together on the private island. Like Charlotte, he is insulated by wealth and works for his own family's lucrative company.

GW is the youngest son of Alex and Blaire. He briefly causes a panic when he wanders too close to the edge of an unsecured walkway, prompting Liam to intervene and return him to his parents safely.

Lincoln is one of Alex and Blaire's four children. He travels to the private island in Indonesia for his aunt's destination wedding, forming part of the chaotic immediate family of the eldest Weston brother.

Nixon is another of Alex and Blaire's children, attending the family wedding events on the private island. He is caught up in the busy, unsupervised dynamic of his parents' stressful marriage.

Jamie is an ex-boyfriend of Anna's who happens to be present at the resort. His brief, friendly interaction with Anna sparks a sudden wave of possessive jealousy in Liam, escalating the emotional stakes of their fake relationship.

Thuy is a server working at the resort during the wedding festivities. She is fired on the spot by Ray Weston after he carelessly collides with her tray of drinks and blames her for the accident.