It's a chameleon of a show. It begins with fart jokes and shocking truths. It morphs into a low-key romance. Eventually the light comedy dissipates in favour of a standard healing drama. The character interactions are good and the backstories are robust, but the situations are not terribly credible and the main relationship looks like more of a background story than a stand-out plotline.

On the cast and acting side I though that it was generally good but both leads were the weakest link. In a show that should have been filled with both laughter and vexation you'd look to the actors' eyes for the key expressions. These two looked like they'd just come off a botox treatment so neither joy nor mortification successfully crossed their faces. Apart from Joo Jong-hyuk, who did very well as the SML, I though that the best performances came from the people who were not seasoned drama actors, those characters being Director Yeon, I-na, and the kid.

Also on the upside, nobody gets stabbed. I find it weird that I have to mention it but that's the K-drama world for you.

Waste of time? No, not really even if I did not rate it highly myself. It's more in the line of "Love is for Suckers" than "My Lovely Liar" so you'll get some mileage out of it if you're looking for light viewing and light romance and are content with a 7/10 show.