Han Yoo Kyung (Han Seung Yeon) wants to be a photographer; Cha Hyun Oh (Shin Hyun Soo) wants is an aspiring dancer. They both arrive in Seoul and meet at a guest house. They end up spending a total of 12 nights together over 3 different trips in 2010, 2015 and 2018.
(Source: DramaWiki)
