Ten years ago, on a train home during the busy Spring Festival travel period, fate brings Xiaoxiao and Jianqing together. Like many young couples, they meet, fall in love, and strive to make it work, but eventually, the harsh realities of life make them drift apart. Ten years later, they run into each other again. Will they make the most of this second chance and rekindle what they once lost?

A coroner reunites with a great love from the past, realizing that the memories are more vivid than ever.

Jules and Chris, two adult former exes who had a bitter past, reunited 5 years after to fix their broken relationship they had when they were teenagers. As they rebuild their lost spark, differences occur when they have to confront the changes that happened to their lives and face the matured version of themselves.

Seoul, 2008. On a bus heading to their hometown, fate brings Eun-ho and Jeong-won together, sparking an unlikely friendship. While battling a bustling and weary city life, they find themselves sharing lofty dreams and a love that comes to feel extraordinary. But, eventually, the harsh realities of life lead them to part ways. Over a decade after the separation, the two unexpectedly reunite on a flight back to Korea, where they reflect on their lost time.