It has a good revenge plot to begin with but the overall premise is technically worthless and an absolute high budget mess, the way it looked like some made up espionage school drama just feels really dumb, and many of the scenes were extremely cliché as if it was intended to be so. The storyline undeniably had some great conflict points that worked quite effectively, but it's incredible how awfully the script was written, character designs are monotonous and the silly dialogues are even more annoying. The only good part will be Lee Chaemin's standout acting performance, for his first lead role he definitely packs some impressive skills on screen, though that's about it while this drama might come down to be the most pretentious kdrama of all time.