1st off I'll say this only "worked" cuz of the actors, mainly lee jong suk. I am a LJS fan, I adore the dude but I'm unbiased when I say his acting improved so much and he carried this on his own
unlike Eve tho where SYJ and the ridiculous makjang were entertaining, this got boring after ep7ish

for acting and character I'll rate them as such

Lee Jong Suk(Park Chang Ho): 10/10, legit carried the show, went from UWU to believable mob boss in 1seconds
Im Yoon Ah(Mi Ho): 8/10 but I enjoyed her time as "minnie mouse". I wish this show was more of a power couple
Kim Joo Heon(Choi Do Ha): 5/10. he was bland the 1st half, unsurprising reveal, over estimated himself and boom he was dead in 1 second
Kwak Dong Yeon(Jerry): 7/10, he was better as the bromance cellmate, got super boring when he was revealed to be a big mouse lanky
Yang Kyung Won(Gong Ji Hoon): 8/10, better psycho villain than doha, 2 overexaggerating psychos in 1 drama gets bland, and he was the crazy one 1st so doha just felt like a copy cat
Ok Ja Yeon(Hyun Joo Hee ): 6/10 seemed more villianis but like miho, the women here were an after thought
Jung Jae Sun(Park Yoon Gab): 8/10, I know the actor as the jijjiri type of evil, so I liked how he got a bigger role and the actor tbh would've been better as real big mouse, he switched between petty villain to power boss well
Real Big Mouse: 3/10, the actor felt bland, his character twist even blander, 99% of the people didn't believe it was him xD
3 VIPs: 1/10. they were a 3in1, they dragged one side kick villain into 3 and made them 3 whiny losers


this show was a fun underdog forced to be the big dog, the prison scenes were fun, but then it all lasted so long that their main fight was just an echo "loooook for pappppeerrrr"
everything was resolved way too quickly, doha big villain that ruined water supply, miho gets sick/dies just as a pawn in the revelation and booooooooooooom, doha is killed

the best parts for me were actually the fact that they were married, but I guess like every other "marriage" in "crime" genres, the wife must die so the husband takes action ;/
this overall felt like a prequel to the story of Park Chang Ho as a real badass big mouse, in a way real big mouse was better off as an organization with no leader, or 1 guy that manipulated ppl, having 1 guy with his own set of organization just for him to die so Park Chang Ho could take over the crown on a silver platter, was all just too simple