It's an entertaining enough drama but there are things about it that make it difficult to suspend disbelief and just go with the flow.

The main characters are pretty enough and also engaging when together but the supporting characters vary widely in terms of both their usefulness to the series overall and acting ability. Likewise the storylines vary in how believable they are, with the last of this season being about human experimentation, with some really poor acting from guest cast. As is often the case with a lot of Chinese dramas, the supporting female characters are left with little to do and minimal character development. I'm not 100% convinced that you could tail someone without them spotting you, even in Hong Kong, driving a white Lamborghini with plates that say 'SCI'?

There's a particularly annoying sub-plot about Bai Xin Tang and Gong Sun Zhe that was both annoying (she basically stalks him) and also nauseating (to the point where I started fast forwarding through their scenes together). I was a bit confused about Xin Tang, to be honest - the show seems to suggest she's also a police officer (maybe I misunderstood this?) but we never actually see her working and she also has bodyguards?

Overall: not the worst show I've seen, it managed to keep my interest all the way through, and the overall eye candy level helps immensely when the plots start to waver.