It's a really enjoyable show overall, but there are some visible flaws that bothered me a lot and that's what I want to focus on in this review. I do recommend trying this movie out if you're not as picky as I am in terms of small details like natural character development and such.

THE COMEDY
The actors were amazing; they played their role flawlessly and nailed all the funny scenes. My biggest problem was the lack of support on those particular scenes with background music. So many times they lay out hilarious dialogues and facial expressions, but leave us with complete, awkward silence. Nothing to accompany the funny thing that just happened. We all know what kind of humor will ensue in this subgenre of body swap- obviously the ridiculous, unbelievable scenarios and awkward misunderstandings that can cause second-hand embarrassment to us viewers. They really missed out on amplifying the comedy by not adding ANY comedic music at all. The uncomfortable confrontations that were supposed to be funny became uncomfortable for me as well. It made me laugh but felt bad for it afterwards. It just left a lil bitter aftertaste in my mouth. I thought maybe they were trying out a different vibe with the lack of comedic musical cues, perhaps a more realistic and subtle approach to comedy like The Office. But... it's not the same. They had background music for the sad scenes, for the intense scenes, for the normal happening scenes, so why not be consistent and add it on the funny scenes too? It was subconsciously jarring and unpleasant.

THE CHARACTER DEVELOPMENT
One of the biggest flaws I found in this show is the lack of portrayal in our main character's development. It posed an important lesson about greed and regrets, but failed to show us the reality of the people living these lives. The main character stumbled upon his first love and for some reason, he just... loves her again? At first we'd assume that they fell apart due to some unforseen circumstances in the past, perhaps some kind of star-crossed lover subgenre. But then they tell us "Nah man the guy broke up with her cuz he wanna marry a rich bich" that left us with our mouths wide open. Say what? You're telling me, the guy feels sorry for abandoning his ex girlfriend because...? Because what? He literally forgot she existed until he saw her again?? He obviously never looked for her or even cared if she was alive! How did he change into a good man??? How could he just give up everything he's ever done, all of his hard work in the company... just to live with his middle class ex girlfriend and biological daughter whom he never cared about in the first place. I'm just so confused. You can't convince me "oh he's changed cause he realizes he has a daughter" like, a GREEDY gangster like him who left his loved one and DISRESPECTED HER IN HER FACE, GETTING ENGAGED WHILE THEY WERE STILL TOGETHER, does not just change into an earnest, caring man in an instant! Stop capping! Man just thinking about it makes me mald.
Also, a lil chubby high school boy trained for like 2 weeks in the gym and all of a sudden he's a sexy, six pack black belt martial arts master who can smack two big-body bouncers and ten "skilled?" gangsters, on separate occasions. I know this is not supposed to be realistic, but that really caught me off guard and it was such a turn off, development-wise. They really do be pulling a shounen anime teenage soft boy training arc into the mix, huh.

Anyway this review became a little too aggressive and informal, sorry about that. I liked this movie, but I had to subtract some points because these factors really broke my immersion with the show, and it could've been better if only they gave it a little more thought rather than slapping a generic comedy trope that ends with a cheesy happy ending and waiting for the money to rain down. Not gonna lie I did enjoy the ending like a good spoonful of sugar, but I don't have a sweet tooth.