The drama story wasn't that great but i believe a drama/series shouldn't be judge by only its story but also about what it brings to its viewers.
Some dramas makes you immersed in its story, some makes you love the characters. Every watcher has its point of view.

I would say that this drama bring you joy, so if you are tired of thriller dramas or want to chill and have a good time laughing and being in a good mood without thinking much. This drama is definitely it. So if a dramas can bring its watchers joy, i would say its a 10/10. Happiness is all that matters.