What were Ri Jeong Hyeok and Yoon Se-Ri thinking of during key moments of their lives? The story is told from the alternating point of view of the two main characters as their attraction evolves to true love.
Next year, the year after that, and even the one after that will all be good. Because I'll be thinking about you. I'll be grateful that you were born into this world. I'll be grateful that the person I love is still breathing. That's why your birthday will always be a good day." Se-ri and her birthdays with - or without - Jeong-hyeok.
Set in 2020, following the series finale. What will the future hold?