I think the lacking part of this was that they over complicated the "relationship" chart... but on the other hand it might've been easier to have one big "evil" company and gather everything in TL rather than having several difference companies which would result in more "bad guys" and also more people to "catch"..

I really hope this shed light on those cases, or any work related crime... it was incredibly heartbreaking for me to see this... and most of the victims were kids or people in their 20s and seeing their parents fight for justice just so their child's death isn't ruled as their own "fault" is too heartbreaking...

now on a drama's point of view, it was wrapped up in a good balance of "solving" the crimes while also leaving a small hint of "everything can't be solved so easily"...
and this was my fault for not focusing when and how it happened, but I appreciate the change in the typical typecastness of the "evil" ones..

my rewatch values are a 1 or 10, but for some reason I'd want to give another shot, though I feel like it'd be too heartbreaking...