Let me be honest. I started watching this series because of Xiumin, actually because I liked the ost. The story is good - and let's do not forget we are talking about 15 min episodes (max). Short and sweet. Perfect if you do not have time but you want to watch something fun. Everyone's acting is amazing and on point. Personally, I loved the ending too. Overall it's something that's worth watching. A refreshing mini-series.
Keep in mind to watch it if you are looking for something simple, fluff and short. It's too short to have the perfectly complicated plot or the amazing character development ( although I liked that too since there is satisfying character development. A bit fast someone may say, but for me it was good.)