Yoonjung and Tegon are a couple with a young daughter. One day, Tegon recommends Yoonjung to learn tennis. It was a lighthearted start, but coach Seoughoon, who gives lessons, is getting on Yoonjung's nerves. Then one day, Tegon goes on a business trip to Germany, and Yoonjung goes on a secret trip with Seunghoon in time. Yoonjung thinks of her family and stops contacting Seunghoon, but finds out that she is pregnant. Seunghoon, who never forgot Yoonjung, visits Yoonjung's house and confides the truth to Yoonjung. Tegon asked Sunghoon to meet his wife to have children.