Clocks were often the basis for time. Calendars for dates and years. Everyone had a specific day for an event, whether it would be a birthday or a visit to the doctor. Oh Hayoung however, was different. She used the leaves of the tall oak tree outside their house as a basis for the right time to leave. When Oh Sehun comes into her life, a lot starts to change because of him with Hayoung being oblivious of it. Would Sehun be able to bring back the fallen leaves? Will he be able to change Hayoung's decision?