Lex Edwards is Charlie’s love interest and another first-person narrator, a businessman dividing his time between London and New York. His complex and evolving relationship with Charlie parallels his journey from a cold-hearted businessman to a character that seeks redemption.

Julian Baker is Charlie’s first boyfriend in a year, known for his charming and caring demeanor. His relationship with Charlie offers an emotional foil to her tumultuous past with Lex.

Nikki Romano is Charlie’s best friend and business partner, providing support, advice, and comic relief while challenging Charlie's perspectives.

Adriana Edwards is Lex’s younger sister and Charlie’s childhood best friend, whose relationship with Charlie is rekindled in the present storyline.

Samantha Benson is a minor character, Lex's ex-wife and past antagonist in Charlie and Lex’s relationship, who returns in the present to offer apologies and encouragement for Charlie.