In 1970s Seoul, university students Seo In-ha and Kim Yoon-hee are separated by circumstances that leave their love unresolved. Decades later, in 2012, their children, Seo Joon and Jung Ha-na, meet and fall in love without knowing the history between their parents. As In-ha tries to reconnect with Yoon-hee after 30 years, two generations face new love, loss and an unexpected reunion.