Honestly, veteran ML Ji Sung and Kim Min Jung are the powerhouses of this show. Their chemistry and cat and mouse game is palpable with tension of love/hate. I LOVED their morally ambiguous characters, it was a fresh take to the other drama tropes out there. Id seen Kim Min Jung in Mr Sunshine but WOW i think she deserves an award for her portrayal of Chairwoman Jung. Its not an easy role to play with her complex and sometimes contradictory emotions and i think Kim Min Jung portrayed it to a tee. The show could not have done without either actor. Jinyoung did a good job but he's nowhere at the level of these 2 veterans though... maybe with time and experience he'll get there. The story is fast paced and keeps you on your toes. It's set in a dystopian theme so bear thay in mind when watching and dont expect everything to be super realistic. Overall a great show with superb acting, cinematography, OST and satisfying plot.