One of those dramas that full of plot holes, but somehow watchable.

Plot's premise was intriguing, but there's almost no answer of anything. Dinner part was forgotten after episode 2 and the other character felt unnecessary.
I think the problem was the duration. There's no enough time to properly tell the story. Probably because the recaps, they spent too much time on that.
The acting was fine, even though there's some scenes where they looked awkward. I didn't like any of the OST (for now). The cinematography was good.

Overall
I won't recommend it to anyone. But if you're going to watch it anyway... Don't try to find the logic, just go with the flow and maybe you'll liked it.