Crammed into the last train of a Saturday night, among drunk people,  Byulyi's attention is caught by a familiar young woman. However, what strikes her is the way the tears fall from her eyes, as it is impossible to stop them. She offers her a package of tissues out of kindness, but Byul is hoping she can get to know this train girl better. Of course, count with her friends, Wheein and Hyejin, to find a way to make her wish true.

Byul and Yongsun's three-years relationship have come to an end. In an attepmt to continue their lives, they start hating on each other, without noticing that there are innocent people caught in their childlish war.  "Yong, it wasn't only our break up." A Moonsun/Wheesa story.