All the hype and interesting plot upto 16th episode went all to drain. From writer's POV this might be a good and happy ending. But, from my view the ending is worst. It's like a firework went upto the sky but didn't burst into beautiful sparkels that we are expected and excited to see. Still I gave an 8 because the story,plot, suspense, subtle romance is excellent till 15 episodes. Everyone in the cast gave their best performance, especially Lee Sung min's performance gave me goosebumps. As I said 8 for 15 episodes and 0 for ending.