Episode #1.5 - S1-E5
Continuity mistake: When Eugene returns to his office, after Moore asks "did you get your revenge", the shot cuts to Gwan-su saying "He kept asking, so I had to tell him" and we can see Eugene removing one of his gloves. In the next shot, the glove is back on his hand and then removes it a second time. (00:12:26)
Episode #1.3 - S1-E3
Continuity mistake: When Jin-a meets up with her friend in the coffee shop, she hands the friend a drink. The friend is shown placing her left hand on the side of the cup and her right hand on the straw. The camera changes angles and both hands are suddenly off the cup and straw. (01:14:49)