After just 4 episodes, I can tell this series is going to be something special. The main "Revenge on higher power" storyline is nothing new for Kdramas, but this show radiates originality with all of its different elements and nuances. Nothing in this show so far lacks originality for me. Even the character archetypes are contrasting enough from most other dramas.
Very impressed so far, and counting the minutes between each episode release.