I was pretty skeptical about this drama when I started it, but once I figured out what type of lens to watch it through I had a great time with Big Mouth! First off you have to throw away what you may know about the prison system or legal system and just go with the flow this drama introduces as the writers are not overly concerned with realism (I saw someone mention to think of the city in this drama like Gotham and that helped me get in the right mind set) . I also didn't get too caught up in trying to figure out who Big Mouth was, I was simply along for the entertaining ride. Therefore I wasn't super disappointed when Big Mouth was finally revealed like I know some viewers were since I hadn't really been endlessly speculating on the topic.

Story
The writers of this drama certainly know how to keep the audience engaged! Plot twists and red herrings galore will keep the audience glued to the screen. Without getting into the spoilers, there are some really clever plot points and clues placed throughout the drama that I believe will stick out more upon a rewatch. I did find that I some points I was a bit confused as to what was going on but that never really kept me from being engaged. The big problem with this drama is the ending, where the writers undermined what they had been building for the previous 14 episodes. Some will feel this ruins the whole drama, but for myself those last two episodes can't take away all the fun I had watching up until that point.

Acting/Characters
This is a very well acted drama; certain actors play it straight while others go full camp with their characters but somehow it all worked!

This is Lee Jong Suk's first drama back from the military and it was a great one to remind everyone that he's an amazing actor, though he definitely shines more in the earlier episodes when Park Chang Ho first goes to prison. The character of Park Chang Ho and subsequently Lee Jong Suk's acting unfortunately fall victim to the writing in the final few episodes. Although on the plus side Chang Ho's suits when he wasn't in prison looked great!

I know some people really don't like Yoona as an actress but I thought she did a really good job playing Go Mi Ho. Go Mi Ho made some questionable decisions throughout the drama (especially near the end), but I thought Yoona portrayed her in a way that made the audience sympathetic to her. Also no character fell harder in those final two episodes than Go Mi Ho, it was almost unbelievable to watch. I felt bad that was the script Yoona was handed after doing so well for the rest of the drama.

The supporting characters all did a great job. Yang Kyung Won in particular was a highlight any time he was on screen. I found it hard to believe he's the same actor who played the guy who was always wearing a beanie in Vincenzo. Also, GIVE KWAK DONG YEON MORE TO DO! The character of Jerry felt a little wasted and almost pointless to me, especially because I know KDY is a great actor and could have handled more.

Music
I don't really remember any of the OSTs, but I do remember the opening and the score. Both were pretty dramatic and matched the vibe of the drama. I did find some music cues to be kind of abrupt and funny, like a character turns their head and all of a sudden you hear someone slamming the piano keys.

Rewatch
I think a rewatch could be fun to see the clues that were missed on the first watch through, but I have a feeling the ending probably will feel worse with a rewatch.

I do think this show fares better when it's watched week to week as anticipation and speculation enhance the mystery (this is how I watched it). I think it could be a little much as a binge. Overall Big Mouth is a really entertaining drama whose last two episode will bring the drama down for many viewers but for me were simply 2 bad episodes in an otherwise great drama.