I must say that this is one of the best dramas I have ever watched. It has everything. It was funny, there was mystery, there was romance. There were no filler episodes and while I almost always skip parts when they are boring for me, I did not have to do it with this one.
One thing that is unique is that everytime FL spoke about anything her work there were illustrations. What was also very good were recreations of the murders with the main characters.
Relationship between all four main characters is amazing. There is no cattiness between female leads, no backstabbing. They are actually friends and more. And the relationship between brothers is also very good, na rivalty, just brotherly love. There also are not any misunderstanding that were not solved in the same or the next episode.
The story is very well paced, I did not feel bored or rushed. Last three episodes have little faster pace but do not leave any loose ends or plotholes so you just feel excited instead of rushed.
There is so many funny moments but it is not parody like humour. There are also sad moments and I have to applause to the actors because they did incredible work.