This drama is about the relationship between people. The drama begins with a question, ‘Couldn’t there be any decent relationship between a married man and a married woman in this world?” It is a melodrama touching your heart to deliver empathy, solace and thoughts about ultimate love to drama fans through the stories of the leading characters. Choi Soo Ah (Kim Ha Neul) works as an assistant purser at an airline. She has been working there for 12 years. Her husband is a pilot and they have a 12-years-old daughter. Choi Soo Ah thinks she is content with her life, but she meets Seo Do Woo (Lee Sang Yoon). Her life changes. Seo Do-Woo works as a part-time instructor in architecture. He has a bright and warm heart. He is married and they have a daughter, but a shocking incident occurs. Due to this, he becomes confused and Choi Soo Ah comes into his life.