The Heavenly Idol unfortunately suffers from a major case of good premise and weak execution. The idea of the high priest that has to pretend to be a kpop idol was fun and interesting, and Kim Min Gue really delivered on his performance of Yeon Woo/Rembrary. But the plot became stale quickly. To make matters worse, two of the central characters were terribly executed. The Evil One was a kind of villain that lacks everything imaginable. He’s not scary, nor charismatic or even has much to do for most of the time. His only quality is not being called Kim Dal... It’s been awhile since I’ve disliked a character so strongly as Dal. She’s extremely annoying and, I don’t know if thats on the actress, but... she’s got the same facial expression for every emotion. She’s extremely bland and had a serious case of bad writing. Sometimes she acts like she’s 12, other times she’s the best professional in the kpop industry. I almost stopped watching the series because she annoyed me so much.
On the other hand, most of the other characters and actors are great. All the Wild Animals members are amazing, as is the CEO. Although I expected him to do more, Gam Jae was great too.