It follows a story of Eunji and Naeun during the past four years of their relationship, how it started and how it simply ended.  

Naeun has been in love with Class 2-B's class president ever since she stepped foot in the university. With no ways to win her first love, nor any plans to start with, she decided to gather her confidence and just confess to the sophomore.

A story of a girl with Hanahaki Disease as she was slowly dying and was given the chance to live, only that she will never remember the love she once had, ever.

A mysterious train showed up on the train station while Bomi, Eunji and Naeun were waiting for a ride home. 

Eunji couldn't understand why Naeun was so attracted to bad boys. Filled with frustration and jealousy, the brunette signed up for the annual music festival just to confess her love.  

  Eunji was a drunkard... well, not exactly. After having an unexpected one night stand with this certain girl, she almost vowed to never drink again, not knowing she was drunk enough for a reason unknown.