iQiyi has edited out half the important stuff, so make sure to watch it somewhere else. But even with the back and forth I suffered because of that, it was clear that this was a good drama.
The final arc is my favourite. And throughout the show, the way the leads figure out every step is very interesting. And the revelations just kept coming at one point during the finale. As befitting a drama dealing with psychological stuff.
But you have to know - this drama cannot be watched lightly. They take the meaning of crime thriller to different level. And by that I mean, the crimes are so creepy, cruel and may cause indigestion - you need to have a strong stomach for it.
Also the first few eps are fast-paced, the next few eps just give you complete depth and feel for it and all of it is just prepping you for the second half in my humble opinion.

Overall, enjoyed this drama a lot - though I had to take a couple weeks break mid-way because my dark mood did not continue for a while. But hey I came back and finished it didn't I?