A story of two couples' journey of new love, loss and unexpected reunion spans decades, from the 1970s through present day.

Jang Keun-sukas Seo Joon & Seo In Ha
Yoonaas Kim Yoon-Hee & Jung Ha Na
Son Eun-seoas Baek Hye-jung
Seo In-gukas Kim Chang-mo & Kim Jeon-seol
Hwang Bo-raas Hwang In-sook
Kim Si-hooas Lee Sun ho & Lee Dong-wook
Lee Mi-sookas Kim Yoon-Hee
Kim Young-kwangas Han Tae-sung
Park Se-youngas Lee Mi-ho