Last Summer

Baek Do-Ha and Baek Do-Yeong are twin brothers, but have lived apart since their parents' divorced when they were young. Younger brother Baek Do-Ha lives in the United States and older brother Baek Do-Yeong lives in South Korea. Baek Do-Ha comes to South Korea and stays in a duplex house with his father and brother Baek Do-Yeong every summer for 21 days. During this time, he spends time with Baek Do-Yeong and next-door neighbor Song Ha-Kyeong. Song Ha-Kyeong's father is also good friends with the twins' father. Song Ha-Kyeong grows up bickering with summer guest Baek Do-Ha, but grows to having feelings for him. She is unable to express her feelings to him, who only visits in the summer. Now as adults, Baek Do-Ha works as a talented architect and Song Ha-Kyeong works as an architectural public official. Because of an incident of 2 years ago, Song Ha-Kyeong and the twin brothers face irreversible changes in their lives.