I was going to give this a 9.5 or 10, but that last episode was a total disappointment. For the most part, however, the drama did keep me entertained throughout. There were many things I loved about the characters and their progress as well as the way the drama handled hints.

One of the things I loved was seeing Changho's progress into Big Mouse. I loved how gradually it progressed. When he first got to prison, he was adamant in denying being Big Mouse. But even when he decided to take on the identity, he didn't instantly change overnight into a serious Big Mouse persona.

For the first several episodes after he assumes the identity, there were many instances where despite many promising fierce looks where you'd think "oh, he's really going to do sometimes now", they'd amount to nothing and you could still glimpse the unlucky lawyer Changho who loved his wife and father-in-law, and was scared of his wife's wrath. He was flustered and stumbled often in his new assumed role before he got settled into it. And the more challenges and situations he faced, the more he settled into the persona until finally we got a Park Changho who was clearly different from the man we first met. I loved that gradual show of his change in personality. That he didn't just wake up one day and was a totally changed man.

Another thing I immensely loved was the hints they threw prior to the many reveals. Some became clear in retrospect after big reveals and some gave you clear hints. For instance, after No Park revealed himself as Big Mouse, it made sense about his card reading talents, as well as how cards found their way easily to Changho even onto his bedding, and why he often hang out with Warden Park. Another one was about Soontae. After the footage taken through the camera in the Virgin Mary statue was edited, Changho pondered about it saying only himself, Miho, his father-in-law, and Soontae knew about it. At that point, Soontae became a good suspect, and further clearance by Jerry eliminating himself and Park Yoongab as the one's who insisted on saving Changho solidified Soontae as being a part of the organisation.

Special mention to Yang Kyun Won for playing the hell out of that role. He was nothing short of amazing as Gong Jihoon. And despite being villains, the three idiots, as I call them, cracked me up often. I loved their scenes and their camaraderie when together. Oh Ryoong as Lee Doogeun especially I thought was amazing. Kwak Dong Yeon and Yoo Tae Joo as Jerry and Tak Kwangyeon respectively, also caught my attention. Loved them! But overall, many of the actors and actresses did a good job with their roles.

Now onto the finale, I was very disappointed to see that despite knowing what Choi Doha was capable of and Park Yoongab even commenting on it, that despite having a powerful and capable organisation to help him plan, Changho did not think of having another plan except for fully relying on Juhee. His enemy's wife who until then had scorned them and shown no interest in helping them. You'd think the thing with Hyejin would have taught them something, not to mention he'd previously hatched his own counter plans to distabilise Doha's, but all that just went out the window. He couldn't possibly have been putting his trust in the justice system. He knew very well it didn't work that easily so what the hell was that?

It was also disappointing that in the end, his only way for besting Doha was to kill him. At that moment it felt like he was just someone who'd gotten in over their head and found out they didn't know how to deal with it. And that's why despite being Big Mouse, he still ended up being Big Mouth because all that talk about taking everything from them, about making their soul burn ended up being just big talk. In the end, except for losing his life, Doha did not lose anything. Even his death was too quick for him to have felt any pain like what he'd inflicted.

And then there's all the plots that were left hanging without proper address and/or closure. Big disappointment that ending was. It took away a lot of what the drama had built until then.