Emotions, Suspens and .. Feels

This is one of the best episode so far.
The case studied there was very interesting and the all episode was conducted pretty well.
It looked like the big villain finally appear and I can't wait to see how all this story will continue.
The feels were too much, and I cried when they showed the two girls friendship memories.

One negative point though : I wished Frost would have been more .. kind to Sung Ah
I know it's part of is character but still ... I felt she really needed a hug.