First the positive:
None of us can deny, that the mains delivered what we knew they would deliver. Especially Son and Choi both bring a nuance to their characters that honestly I wouldn't have gotten from the writers.
Cinematography and editing are immaculate. This probably can also be hugely due to very good direction. I thought I would get dizzy from the match cuts after a while but they continued to be se interesting I didn't (the fact that the cuts actually added to the storytelling is a big plus).
All in all very pleasing to look at.

However the unwillingness to decide on a tone was hard to ignore. Is it trying to be gritty? funny? melancholic? what is going on
Messaging is also quite muddled.
This is all due to the writing I must say.
And it all goes wrong with the addition of a character (actually two but one is dependant on the other). The moment we meet RoBin this kind of falls to pieces for me. And as soon as that happens our story shifts from whom I assumed to be the main character for the first 4 episodes. Tang kind of runs around grabbed by his strings throughout the rest of the story. Seeing how his character conflict from the beginning is his inability to decide on what to do and just going with the flow I felt like we threw all of his chances on changing that out the window. Unless I am missing something his character gets stuck right there and it is frustrating.
Personally I couldn't bring myself to be interested in Cho whatshisfaces story. That might be just on me. But each time he occupied the screen I was wishing for Tang and NanGam back.

All in all this story failed for me. On one side due to my expectations of this being a sharp cat and mouse game a la Heat or Catch me if you can (to be fair that is what the promo made me believe). On the other side losing us due to the writing in the second half.

That being sad I enjoyed our mains and again technical aspects of this are brilliant. The drama is a solid middle tier for me.