Nat, a high-strung advertising executive, and Josh, a laid-back aspiring novelist, fall in love quickly and decide to get married despite their significantly different personalities. Their whirlwind romance culminates in a wedding just seven months after they first meet. However, their honeymoon period is short-lived as they soon discover that their differences create mounting tensions. Nat struggles with Josh's lack of ambition and untidy habits, while Josh finds Nat's controlling nature and obsession with her career increasingly intolerable. Both seek advice from friends and family, who are skeptical about the marriage's longevity from the start.

As Nat and Josh attempt to navigate the rocky terrain of their first year of marriage, they are each tempted by other romantic interests. Nat is drawn to the sophisticated and charming Guy, a client at her advertising firm, while Josh reconnects with his ex-girlfriend Chloe, who remains supportive and understanding of his creative pursuits. Their inability to reconcile their differences leads to awkward situations and comedic misunderstandings. Throughout the journey, they begin to question whether love and compatibility can truly coexist. With their one-year anniversary approaching, Nat and Josh face a crucial decision about their future together.