Pace of story is slow.Eg:30secs to open go downstairs and open a door.
Plot was good because one have to keep guessing who is the good and bad characters.
If it was not for NamGoong Min,I probably stop watching.Had to fast forward the entire 16episodes because it cringed on how they can paused for conversations when guns are pointed at them.
Female leads can fight.But towards the end,all their characters are so weak,it's ironic.