Min-ji is an ordinary housewife with a dark secret. Unlike the wishes of her husband, In-gyu, who has a business running resorts, they don’t have a child yet. They’ve tried test tubes and home remedies, but nothing has worked. Her husband and her in-laws finally decide to get a surrogate mother, and Min-ji has no choice but to agree to it, as she is worn out from their pressure. Hometown friend Jeong-ah comes knocking on the door. Min-ji is uneasy with Jeong-ah around, as she knows her past secrets, including the time she lived with someone else and had an abortion. On the other hand, In-gyu has completely fallen for bold and sexy Jeong-ah. Like a crow that nests in another’s nest, Jeong-ah takes over Min-ji’s place slowly and gradually. Min-ji is driven into a corner, so she meets Jeong-ah’s husband, Joo-sik, to stop her. However, she falls for his trap and is used to replace his wife who ran away from home.

In 1994, on the first day that Yoo Yeul went on air as the new DJ of the popular radio show ‘Music Album,’ a college girl Mi-su meets Hyun-woo who happens to drop by the bakery she works at. Like the music streaming from the radio, their frequencies slowly come in sync; even when they’re apart, the show brings them together through ebbs and flows of events arising from both pure coincidence and inevitability, until the bitter reality sets in and drives them apart…