First, be aware of the tags and description, this drama is +18, it shows many hard "gore" scenes.

This drama has intrigue storyline with well though cases and is switching between the outside crime investigation team and the struggles of our main lead in the prison. What I really liked is how all the cases and also the characters somehow all were connected and you can see it slowly unfold with every episode you watch.

The good camera quality, also the color nuance and the great accompanying music are very well chosen for this kind of drama and enforce the suspense fully. The main actors are doing awesome job, but what surprised me was the acting of the supporting characters. The actor’s expression let me be part of the whole world and I could feel the desperation and feeling all characters went through. The OST is also very well made.

Liang Yan Dong is one real mastermind in solving crimes. We could see through his eyes how some crime could have happen and this helped us to follow his genial thinking much more. With his thinking and profiling I was really surprised about what he could think of. I also found him really great teacher to the young and hot blooded Ren Fei. Ren Fei was my favorite character who really grew as character with the drama. I really enjoyed his character. From female actresses I was amazed by the performance of Eleven Yao in her role as Wu Yu Xin.

Now to the only flaw I have with this drama: The police was shown in bad light, couldn't really contribute much to solving the cases, were often clueless and also made some stupid decisions, which lead me to roll my eyes sometimes and to look at Liang Yan Dong's super deduction ability much more.

Altogether it is one really good suspense crime drama with great visuals and quality. You can see good production here.
S1 ends with big cliffhanger and shows also some secrets at the post credits. Don't forget to watch S2.