Let me say that the idea behind the show is quite fun, family/ spy thriller drama where the main secret agent is working as a baby sitter to gather information, bless him.
All the parts about the K.I.S group were great, there investigation techniques and the serious way they navigate daily life was exciting to see and very relatable as well, especially the power a group of Mom's on a texting app can possess and their ability to influence each other, let alone how funny they are. Their scenes were always fun to watch really, and surprisingly they were smarter and more thorough than the secret agents' society,
When it comes to the Acting, not a single actor disappointed me, maybe Ra Do wherever it's an emotionally intense scene, but he was charming in all other aspects, so I can let that pass.
However, as an average person I could see that the serious stuff were done half-heartedly as I felt I was watching an early 2000's Asian show, a lot of plot holes and stupidity, the professionals are acting like no one can see them while they're carrying a mission, even though we know the professional agents can't act so recklessly, they hang around the same places all the time even when someone pretends he is dead, he comes back to where he was and trots around freely assuming people will not recognize him, that's only an example.

this is a show that's fun for its family value great acting and characterization,, but underdeveloped and half-assed when it comes to the serious aspect, totally unforgivable considering how developed the Korean Drama's are now in the crime, spy, thriller genres. However, if you don't want to be too serious and involved in something and just watch it for fun, this is certainly the show for you, and your family, they will love it.