I am a huge fan of the series Dr. Qin, I personally loved the first and second one the most. This season was downhill for me. Although they don't reuse the same actors, at least the first and second ones, the assistant name was changed, making her a brand new character so I did not mind. This season, the assistant really rely on Dr. Qin, it's as if she doesn't have any forensic knowledge or anything, but it doesn't make sense if they continued it from season 2, using the same character, but in season 2 she already had good knowledge in forensic and work together with Dr. Qin rather just assist him.

Another thing is this season they stirred up too many conflicts between Dr. Qin & Lin Tao that it became annoying over time. I realized the character, Lin Tao, in this season isn't as quick and smart as the previous two seasons, it seems as if they want to make him the 'comedy' of this drama, so everything he said most of the time doesn't get taken seriously. Aside from this, Lin Tao literally being looked down on by Chen ShiYi when the other two seasons, literally respect for him and work, so I wasn't sure what they're trying to do here.

Lastly, I think to try for a drama to reuse character, names and life, it doesn't make sense to make Dr. Qin having to dead girlfriends for two seasons, and tried to make a relationship out of Lin Tao and Chen ShiYu too.

I would say, if you watch the other two seasons, I recommend you not watch this one. Although all the cases are good, I feel that they're trying really hard to make all the cases 'cruel' but then it got repetitive. I personally think if you watch this one first, then you can go ahead and watch the other two.