Millie is a resilient woman in her early thirties who previously worked as a housemaid and is currently studying to become a social worker. Having spent ten years in prison after defending a friend from a violent attacker, she now dedicates her life to helping women escape abusive marriages. On her wedding day, she tries desperately to maintain control and have a traditional ceremony at Manhattan City Hall, ignoring the creeping threat of a stalker.

Enzo is a landscaper originally from Sicily who met Millie while they were both working for the wealthy Winchester family. Driven by the tragic loss of his sister to an abusive husband, he actively partners with Millie to help other women escape domestic violence. He focuses entirely on his love for Millie rather than the superficial details of their wedding ceremony.

An unnamed, vindictive caller who repeatedly harasses Millie throughout her wedding day. Angry that Millie helped his wife leave him and take their children, he tracks Millie's movements through the Bronx to Manhattan. He uses psychological intimidation, describing her clothing and surroundings to prove how closely he is watching her.

Millie's estranged mother, who cut ties with her daughter a decade ago when Millie was sent to prison. Although she initially agreed to attend the small wedding ceremony, her lingering judgment of Millie's life choices and resentment toward Enzo create significant emotional turbulence on the wedding day.

A bald man who makes Millie nervous by observing her near the wedding venue. He is deeply grateful for the dangerous work Millie does to protect vulnerable women.

A tailor and personal friend of Enzo. He provides a crucial, last-minute service on the morning of the wedding by altering Millie's light blue dress so she can wear it to the ceremony.

Enzo's deceased sister, who lost her life to an abusive husband in Sicily. Her tragic death forced Enzo to flee to the United States and remains the driving force behind his dedication to helping other women escape violent homes.

Paul's sister, a woman who found herself trapped in an abusive relationship. Millie intervened to save her roughly a year before the wedding day, an action that earns Millie lasting gratitude from Dee's family.