Mirabelle is a young woman who works in a Montreal dress shop and meticulously follows complicated skincare regimens. Struggling with low self-esteem following the recent death of her mother, she travels to California to handle the estate. She soon visits a high-end spa called Rouge that promises magical treatments. She relies on online skincare tutorials and chemical exfoliants to manage her anxieties.

Noelle is Mirabelle's glamorous, French mother who moved from Montreal to California to pursue acting. Described as extraordinarily beautiful with dark red hair, she leaves behind significant debts and a dilapidated apartment after a fatal fall. Her demanding personality and critical comments about appearances deeply influenced her daughter's insecurities.

Seth is a mysterious figure from Mirabelle's childhood who appears to her through a cracked mirror. Taking on the appearance of a famous movie star, he acts as a confidant to a young Mirabelle. He validates her feelings of inadequacy and encourages her to resent her mother, creating a dangerous wedge in their family dynamic.

Hud is a man Mirabelle meets in California who takes an active interest in her safety. Bearing a jagged scar on his cheek, he researches the Rouge spa after his brother experienced severe adverse effects from their treatments. He repeatedly crosses paths with Mirabelle and tries to warn her about the wellness center.

The Woman In Red is the enigmatic leader of the mysterious spa known as La Maison de Méduse. She wears striking red garments and speaks in cryptic phrases about "going the way of roses." She offers free facial treatments to select candidates, cultivating an environment of exclusive luxury and strange rituals.

Sylvia is Noelle's former business partner who takes full ownership of their dress shop, Belle of the Ball. She changes the boutique's avant-garde aesthetic to cater to a more generic commercial clientele, much to Mirabelle's annoyance. Despite her meddlesome nature, she shows genuine concern for Mirabelle's well-being following the funeral.

Tad is Noelle's young landscaper who makes himself entirely at home in her apartment. Casual and familiar with Noelle's space, he frequently offers to help Mirabelle renovate the apartment to rent it out on Airbnb. He treats Noelle's home as his own territory.

Chaz is Noelle's lawyer who handles her complicated estate following her death. He bears the unfortunate task of informing Mirabelle about the massive debts her mother accumulated over the past year.

Marva is a popular online "skinfluencer" who creates extensive skincare routine videos. Her dogmatic advice heavily dictates Mirabelle's daily habits and product purchases, representing the overwhelming pressure of internet beauty standards.

Mirabelle's grandmother, who steps in as a primary caregiver in Montreal while Noelle pursues her career and romantic interests. She provides a sense of stability but often encourages Mirabelle to suppress her negative emotions.

Lake is a fellow client at the Rouge spa whom Mirabelle mentally nicknames due to her incredibly smooth complexion. Like other patrons of the facility, she is highly invested in her cosmetic procedures but struggles with profound mental fog and memory loss after her sessions.

An impossibly beautiful, silver-clad male and female pair who assist The Woman In Red at the spa. They escort guests and ensure the smooth operation of the facility's enigmatic treatments.

Bryce is a Los Angeles film producer whom Noelle dates during Mirabelle's childhood. His presence in Noelle's life sparks intense jealousy in a young Mirabelle, who resents sharing her mother's attention.

Edward is Hud's brother who previously received treatments at the Rouge spa. His severe physical and psychological decline after visiting the facility alerts his family to the dangers of the wellness center.

Persephone is Mirabelle's boss at a dress shop in Montreal. She attempts to contact Mirabelle regarding her prolonged absence from work while she extends her stay in California.

Esther is a shop assistant working under Sylvia at the Belle of the Ball dress shop. She tries to enforce Sylvia's rules when a disoriented Mirabelle causes a disruption in the store.

Al is a local antique dealer in California who buys items from estates. He is visibly uneasy around certain wealthy patrons who frequent his business.

Stacey is a childhood friend of Mirabelle whose family garden features prominently in Mirabelle's early memories. Mirabelle is sent to collect roses from her property.

Alla is Stacey's mother, a neighbor who catches a young Mirabelle trespassing in her garden. She takes it upon herself to reprimand the family for the intrusion.