Ji-Young (Han Chae-Young) works as an announcer and she is married to Jae-Wook (Bae Soo-Bin). Her husband is an architect and he comes from a wealthy family. Ji-Young is also pregnant. Her life seems perfect, but she learns that her friend Na-Kyung (Oh Yoon-Ah) is pregnant with her husband’s baby. Even though Jae-Wook begs Ji-Young for forgiveness, she divorces him. Na-Kyung also has a miscarriage. 6 years later, Ji-Young is remarried. She lives with her husband Min-Ho (Lee Chun-Hee) and her 6-year-old son Hyun-Woo. One day, Hyun-Woo is diagnosed with leukemia. She learns that her bone marrow is not a match for her son. To save her son\’s life, Ji-Young meets her ex-husband Jae-Wook for the first time in 6 years. Jae-Wook is now married to Na-Kyung. Jae-Wook learns that his bone marrow is also not a match for Hyun-Woo. At that time, a doctor suggests to Ji-Young and Jae-Wook to have a second child for a bone-marrow transplant. The ex-spouses face a difficult decision.