I was curious at first and thinked this is gonna be best Drama but i've watched one by one eps the plot was not unpredictable. All are good except the story. I love the music, acting, and i got the feeling but at the end of story when they got all of 3 way to kill Gwi, they need 120 years to make that plan but they didn't used that plan to kill Gwi. It was so easy to killed him by sunlight and bombed the underground's castle. They shouldn't needed to wait 120 years if they did it. I just said this Drama had overpowered Enemy but they killed him easily without the plan they habe made in 120 years