Alice is a 39-year-old mother of three who wakes from a severe head injury believing she is 29 years old and happily pregnant with her first child. She is shocked to discover she is actually wealthy, painfully organized, and in the middle of a bitter divorce from her beloved husband. Trying to understand a life she no longer recognizes, Alice works to reconcile her carefree former self with the strict, assertive woman she seems to have become.

Nick is Alice's husband and the general manager of a successful company. To the newly awakened Alice, he is surprisingly bitter, pompous, and angry, presenting a sharp contrast to the loving partner she remembers from ten years ago. He is exhausted by their separation and custody battles, harboring deep resentments over feeling disrespected and unappreciated in his own home.

Madison is Alice and Nick's ten-year-old eldest daughter. She is traumatized by her parents' separation and struggles with severe behavioral issues at school, acting out her emotional pain. Madison feels things deeply and harbors hostility toward Alice, sensing a lack of maternal affection that the newly amnesiac Alice must attempt to understand and repair.

Elisabeth is Alice's older sister and a successful self-made businesswoman who hosts expensive direct-mail marketing seminars. Her life is dominated by the profound grief of multiple miscarriages and failed IVF cycles. This ongoing struggle with infertility has left her bitter, depressed, and disconnected from her once-close relationship with Alice.

Dominick is the principal of the local elementary school and Alice's current boyfriend. He is kind, unpretentious, and down-to-earth, presenting a sharp contrast to Nick's polished corporate persona. He provides Alice with a gentle, supportive presence as she tries to make sense of her current life.

Frannie is Alice's honorary grandmother who lives in a retirement village. She is an observant and thoughtful woman who frequently corresponds with her fiancé, Phil. Frannie provides a grounded, historical perspective on Alice and Nick's relationship through her observations over the years.

Ben is Elisabeth's husband, sharing her enduring struggle to start a family. He tries to be supportive but feels the strain of their ongoing IVF treatments and considers alternative paths to parenthood, which sometimes causes friction in his marriage.

Barb is Alice and Elisabeth's mother. Formerly demure and shy, she has recently undergone a dramatic personality shift, becoming loud, outgoing, and passionately involved in salsa dancing after remarrying.

Roger is Nick's brash father who is now married to Alice's mother, Barb. He shares Barb's new passion for salsa dancing, creating a complicated, overlapping family dynamic that confuses the newly awakened Alice.

Tom is Alice and Nick's middle child, an energetic third-grader. He is curious, rational, and interested in science, trying to logically understand the medical reality of his mother's sudden memory loss.

Olivia is Alice and Nick's youngest child, currently in kindergarten. She is affectionate, endearing, and generally considered the baby of the family, reacting to Alice's condition by making her glittery get-well cards.

Gina is Alice's late best friend whose tragic death heavily impacted Alice and the broader community. Although Alice cannot consciously remember her, Gina's presence lingers over Alice's current life through memorial baking events and the unresolved grief of those left behind.

Xavier is a resident at Frannie's retirement village. He is an adopted father of two who enjoys intellectual conversations and patiently pursues a friendship with Frannie despite her initial irritation with his presence.

Phil is Frannie's fiancé, to whom she frequently writes letters detailing her daily life, her observations of the retirement village, and her thoughts about Alice's family drama.

Jane is an acquaintance from the gym who assists Alice immediately after her injury. She treats Alice with exaggerated slowness and later reveals herself to be more of a superficial contact than a genuine, reliable friend.

Kate is a wealthy, fashion-conscious mother from the children's school. She represents the high-status, image-obsessed social circle that the 39-year-old Alice has actively integrated herself into over the missing decade.

Dr. Hodges is Elisabeth's psychiatrist. Elisabeth writes detailed journal entries addressed to him as a mental health exercise to process her grief, anger, and anxiety surrounding her fertility treatments.