this is about the IU and yoseob couple. The two are who they really are now- IU a solo singer and Yoseob a Beast member. They are banned from seeing each other ever since they were caught on camera secretly dating last year. Still the two tries to be together but keeps failing until they meet for the last time to give up together. After 5 years passed since the incidence they coincidentally meet. You have to read the rest to know what happens! :)