This has everything that Korean dramas usually have. Past connections between FL and ML, secret dating in the office, overflowing office pantry, good aesthetics, soothing color palette, irritating second ML and second FL, totally interesting colleagues in the office. Apart from the ML and FL, I noticed the diversity of acting in Tae In Ho and Kim Ga Eun. Both characters were well written and portrayed. I was more interested in their dynamics than the original storyline. They were total fun to watch. Cliche storyline. I mean, the story went pretty predictable and I think there is something about the serial killers/thieves that are always in dramas. The whole black outfitted, cap and mask-wearing random/bad people is so out of fashion. I mean doesn't the whole black outfit negates the "hiding in plain sight" concept? I would totally notice a human in a full black outfit for 1) Black is awesome, 2)Black is sexy and 3) It draws too much attention. Let it be. That is a food for thought for writers out there.
I enjoy and even wait for the episodes. So, I can say it is pretty good. I would not be gearing up for a rewatch though.