Take note, that this is not a love story. It's a story about two lovers whose romance fell apart. And while one takes the events as a learning experience, the other won't be so quick to let go. This story will take you through the afternoon walks; the late evenings spent together; the morning confusion as to why they're both in the same bed, as Sehun examines the 500 days they spent together - trying to determine when they lost the spark.