This is the best. I love it. The actors were perfect and their roles also fit them perfectly. My favorite characters were Dung Cheol (woo do hwan) and Seung Min (song ye jin). They blend in well with the story. I also love the chemistry between the four friends. It was not like a fantasy, and they did have conflicts but they got through them. REAL FRIENDSHIP!.
I also like how this story conveys the conflicts, and I love the conflict itself. Though the whole cult thing seems surreal, the bullying and corrupt government (governors) were portrayed realistically. I hesitated to watch this because I thought it had too much angst (especially after finishing mouse I needed a break) but it was just right. Highly recommended, underrated drama. Trust yourself and WATCH THIS ALREADY!!!!!!