[SPOILER ALERT]

So first of all i think this drama start with a weak beginning all the character is annoying except NS3 but as the episode goes on the character of this drama has it owns character development, especially Kang So Bong So, her character was annoying at first but she turn to be a subtle character as the episode goes on, and as for the NS3 the most stand out is his emotion development as you can see he was start as a obedient robot and never make his own decission, but as the episode goes on he can make his own decision and judgement, and don't forget about plot twist in this drama you can't ever predict the plot twist and that's makes me worry about the ending cause the ending is so unpredictable, all the cast is amazing especially Seo Kang Joon acting who can switch character so smooth, all of the OST on this drama is good even i downloaded it for my daily listening. the reason why i dont give this drama 10/10 is there is still a several kdrama logic that a bit bothers me such as third person camera that NS3 show to KSB with projector on episode 16, but thats the only reason but the exact rating i'll give to this drama is 9.8 all of this drama is perfect except the really small amount of kdrma logic that bothers me