Ok, so this show is originally based on a US television show which I haven't seen so I'm not going to compare the two.
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Story:
Overall ->
It wasn't terrible or exceptionally good but it could've been better. First seven episodes couldn't keep my interest because it involved the characters solving one case after other. Only when they all combined to form one big picture did it become interesting enough for me to binge watch it ☆⌒(≧▽​° )
What I loved ->
1) For someone who bore easily, this one was well done. It was nicely paced and kept up the excitement till the end.
2) Characters were funny, smart and not too emotional. Their friendship and care for one another (and the van in Tae Joon's case) was adorable. They really gave the sense of a family who loved teasing each other and making light of dire situations.
What I hated ->
1) Open ending. I hated it the most. They could've wrapped it up nicely but nah, they had to mention entirely new thing in the end.
2) Character development wasn't the priority in this. It could only be found in the cases of Tae Joon and Roy (only a tad bit).
3) They didn't explain why the bad guy hated our hero and why he did what he did. They could've explored his character a bit.
4) I was disappointed the way with which they dealt with Tae Joon's wife. They just brought her in the start and then she vanished altogether. I kept looking and waiting for her character when the 'big' case was solved.
5) Ok, there were hints of romance but they were so very subtle. I would've liked a proper hint by the end but nah, they robbed the viewers of that!

Acting :
The reason I chose to watch this drama were Kim Kwon and Kim Sae Ron but gotta say, I loved Kim Kwon more in He is Psychometric. In this one, he was funny and a good fighter but I think the main purpose of his character's existence was fan service. Ohh we got tons of it ☆⌒(≧▽​° )
Kim Sae Ron has grown and I loved to see her playing a badass (more rude tbh) character!! For someone who's an amazing actress, her character didn't do her justice or maybe she isn't like she used to be? I felt something missing in her part. The one who surprised me the most was Lee Dong Gun. Gotta say, I didn't like him in Angel's Last Mission but he was AWESOME in this one. His character went through number of challenges and gotta say, he portrayed the feelings of his character fantastically. As for the other two in the group, it's my first time seeing their work and they've done a remarkable job of a failed actress and a genius hacker (who's ignored a lot too...Poor guy (｀▽´) )

Music :
I LOVED the music!! OST : Con Artist was spot on and I loved Game Over by Dickpunks as well. Western tracks used in the credits were a bonus. The background tracks were perfection!! I know I'll be looking for them now XD

Re-watch Value :
I'd always rate this one low because I RARELY watch anything twice. While this drama can be a good re-watch for most of the people for its thrill and fun characters, I know I wouldn't so I'd stick with middle rating i.e 5!!!

P.S: This is my first review after years!!! So forgive me if its terrible or makes you confused more than amused or satisfied!! Adios! (●ゝω)ノヽ(∀＜●)