This is one of the greatest drama that I have watched so far. The cast itself is already quite unique because many of them are from failed idol like Exy {WJSN}, Ahn Sol-Bin (Laboum), Green (Red Square), Hani (EXID), and even actress who doesn't have any experience in idol group, Han So-Eun. The music in this show is breathtaking. It is even greater than usual kpop songs. The story is 10 out of 10. The pace of it is quite great and the plot itself can pull the emotion from the watcher in every episode which is kind of rare in other drama. I greatly recommend this greatly.