This is pretty much a fanfic adapted into a k-drama, so don't go into it with too high expectations.

Overall, it was an ok-ish watch. I would have liked to see better acting (particularly from Lee Sin Young, as he was supposed to be the "main" lead of the show—he had the emotional range of a plank of wood for most of it), and a different ending. Just let the evil guy be evil. Why throw in a pointless "oh, he's just lashing out because he's hurt" twist? The guy schemed, lied, cheated and stole with the objective of tearing down the mart to erect a building there. Evil is, as evil does; the villain should have been defeated and sent to jail.

Also, I didn't get what the point of Gina, the girl idol was. Her relationship drama with Young Min added absolutely nothing to the story. Same as the love triangle barely hinted at between Ho Rang, Ye Rim and Tae Ho.

I feel like a better writer could have actually made a fun, enjoyable show out of the premise of a bunch of estranged, washed-up idols running a mart together, like for example if Ye Rim had been a super fan of Thunder Boys, and thus had vested interest in them making up and being successful in running the business together (plus, her quietly losing her mind out of excitement over meeting her favorite idols at first, only to eventually learn they are just normal people would have been a fun, meaningful development). Disappointing, really.