Disclaimer : I haven't read all of the original stories, but surely will after watch this drama.

I enjoy the dynamic between the (main) characters. We know STY is the big brain of the team, but the other character is also play a big role to solve the cases. STY probably can't solve those cases easily without the information provided.
As for the character,
STY : He's quite and might looks cold but still well-mannered and respectful, not that usual scumbag ML type. (still can't defeat David Suchet's Poirot).
LSC : Sometimes I see LSC as a really dumb spoiled police, but I realized that his thought is simple and represent 'common' people thoughts, which offer view that STY often missed to see.
JQM : He really did a helpful job for both STY and LSC. I like the way they put consideration to make him shine.
ZMW : A perfect combo of beauty and brain. STY - LSC have a better chemistry but can't blame her bcs romance is not the big theme here.

I know they try so hard to make us suspect some people, but even for someone who hasn't read the original story like me, the villain is still noticeable, so it's not a big surprise when they revealed the villains of each cases. Actually feel a little disappointed with the way they finish the story. How they reveal the main villain and how they make a plot twist with some character at the end, but overall it's still worth to try especially if you like are new to detective, republican, with bromance and a sprinkle of romance.