Drama series depicts the love story between Yoo-Kyung (Han Seung-Yeon) and Hyun-O (Shin Hyun-Soo). They spend a total of 12 nights together over 3 different trips in 2010, 2015 and 2018.In 2010, Yoo-Kyung aspires to become a photographer. She arrives in Seoul from New York. Hyun-O wants to become a dancer. He arrives in Seoul from Tokyo. They arrive in Seoul without any specific purpose and they first meet at a guest house.