To begin this review let's all raise and stand in praise of all the actors (JCW oppa especially )!!
The show belongs to it's actors and it's definitely one of the best career performance by everyone !

SYNOPSIS - JCW oppa sneaks undercover in a gang to trace the origins of a drug cartel and in the process becomes someone who he fails to recognize aswell.

Chaos unwind and soon everything is shattered to pieces. With a strong narrative

ACTING and CAST -
OMGGGGGG!!!!!!!! 200/100 performance ...
This by far is the best acting I have seen in any Kdrama and mind you even tho I haven't recieved my first time watcher badge I got a lot under my sleeve. JCW'S eyes speak for him his face is too expressive to be normal ...hence the headline lol".

ACTION AND VISUALS -
I would just say that it was too realistic and way believable bec even when you feel like this can not be happening it actually works bec you just get so immersed in their expressions. Visuals ...umm JCW oppa looks smoking hot and I didn't bother about other visuals lol .

WHY MUST YOU WATCH -
The story line has a soul of it's own even tho it's not a very new kinda story line but the plot is gripping enough and no useless side characters distract you all the time. Everything in the narrative serves a purpose which unfolds beautifully.
The show touches the darker side of human emotions and the ending brings a sense of satisfaction that is unmatched.
The most realistic ending the best of acting and a good narrative that maybe predictable but is definitely interesting and full of raw action sequences and swoon worthy JCW oppa is what this show offers.

MY FEELINGS AS A VIEWER-
As a critique I could easily say that the show is not new to drama world and stories like these are more often than not brought to the screen for spy dramas. Infiltrating in an gang is a very common drama-land phenomenon. But this show has a lot of emotions at stake. By the end you do not side with good or bad because the line that creates that distinction really just blurs out and that's what makes this an interesting watch !

----SPOLIER ALERT ---

For those who have already finished I got a few things to talk about.
I read a comment that said that "The biggest difference between ki chul & Eui Jung VS that of Joonmo & BIBi relation was that, in Joonmoo & Bibi relationship Joonomo never accepted her love but Eui Jung was somewhere looking for that love she did have a chance with." - To quote some examples Joonmo never said any affirmative words to Bibi and always had a wall up front every time they met. which even Bibi pointed out in the course of the show. While Eui Jung literally fell for him and tried to change him as a person through her love. By the end she became negligent of Joonmo's emotions and only cared about Ki Chul she did not do it to fulfil her husband's mission but rather wanted her love to walk the right path.

Ki Chul's character was a very fine written sketch where he constantly had this dilemma of who to trust and who to choose. He made decisions with his heart and brain and the way that the switch from heart to brain happened was so natural to me that I could easily see that things weren't his fault.

Joonmo's dilemma and pain that he went through was so evident in JCW's acting which I shall call shear brilliance. The way he felt when he couldn't be there for Eui Jung's mom's funeral the way he reacted to murder before him. the way he looked when he killed people trying to protect Eui Jung and the dialogue - "there's someone I want to protect in my heart". was a literal treat to eyes. !!!

I shall applaud Im Sae Mi for giving life to Eui Jung as she literally had us all in the process of falling for Ki chul ...bec even when we know she's not true to her husband and his cause she was true to herself and her love. Till date I have never liked a disloyal character but ig we have an exception now.

The side characters and BIBI have literally worked as good as the main cast ...Kudos to them !
but the Detective's role felt rather random and forced. His obsession with Ki chul was too much and he wasn't handled well by the writers but his story ended well ...

Music wasn't really the most memorable but it didn't become a bother so I'd give decent points to it !

OVERALL - MUST WATCH FOR JCW FANS AND PEOPLE WHO APPRECIATE GOOD ACTING !
ps . the name of the show didn't really fit tho !