Bae Irene. Kang Seulgi. The top girl group leaders of South Korea. And.. Ex-lovers?! Bae Irene and Kang Seulgi were totally in love. But that was 4 years ago. Now leaders of their successive groups, each of them hoped that their paths would not cross again, ever. But that was before a huge scandal between the two groups broke, and they are forced to work together. Again. Old wounds would resurface. Buried feelings will show up. But is it enough to restart what they had?