it's been years since Y/N and Yunjin had seen each other since their breakup. Yunjin had went to become a famous idol like she said she would be and Y/N had become famous doing what he loved, traveling the world with his band 'Light' and becoming the biggest rock band that the world would know in this generation. But when the two past lovers meet each other at a (his) concert, unresolved feelings and emotions come back to light and now the two are yearning for the closure they both so desperately wanted, but when their forced into an uncomfortable situation where they are forced to face their feelings head on, things leads to something they both least expected. or when two ex lovers are made to make a collab song together.