'Mary' showcases a bittersweet story about the daily life of a 65-year-old woman, Mary, and her beloved 70-year-old husband, Robert. Throughout the story, Mary tries her best to be the perfect wife by supporting Robert and always being there whenever he needs her. She supports him while he tries to find a job, and one day, Robert comes home with a new contract. Mary races with excitement and does her very best in taking care and supporting him even more. They continue to live happily before a certain twist occurs, revealing the sad reality Mary has been hopelessly living in and trying to hide and run away from for many years. A specific circumstance that took place long back, one which shook Mary and deeply affected her—changing her life forever.