This is really underrated and under appreciated, a few terrible comments and reviews almost stopped me from watching it..
This is a unique show, no matter what you everyone thinks this is something you'll only experience once in your kdrama life. People watch and accept regurgitated kdramas with all the same cliches and troupes, but criticize something unique so harshly.
The cast was superb, especially Lee Yoo Ri, and Lee Min Young.
It starts off with dark comedy (imo one of the funniest I've seen) but gets more serious on later episodes, with the consequences from all the comedy riling up. And has a little sad touch in the end.
All these parts are well written, the story is not very realistic, but serves it's comedic purposes, the seriousness and the sad plot in the end is good enough to tear your heart apart. The ending closure was great and left NEARLY nothing to be desired. (There are some loose threads).