On the verge of turning 40, a woman reflects on her life. At 39, 15 years into marriage, and mother to two children, she recalls her past. Her father was a transfer worker, forcing her to move constantly throughout her childhood. Unable to form close bonds or lasting friendships, she grew up in solitude. After leaving home upon high school graduation, she tasted freedom for the first time. Those days were fulfilling, filled with love and heartbreak. However, in her early twenties, she married a man in the same profession as her father, following her parents' strong advice, and spent the next 15 years conforming to her husband's life. Before she knew it, she stood at the threshold of 40. Haunted by memories of the past, she finds herself tormented by a chance encounter with a complete stranger.