Miami Vice: The Game?
Fahrenheit: Indigo Prophecy?
I'm unsure as to what the hints are supposed to point towards to. Just as kalirion noted an actual game screenshot might help.
My deductions so far:
* top-down shooter like Hotline Miami
* release post 2015 (that is when HM2 released) since his hint literally is noneXistant HM3
* one main figure is asian (whether PC or "boss") and/or game plays in asia
Whether that is any helpful or even a correct conclusion is anyone's guess, without an actual fresh screen this seems to go nowhere.
**edit: and just to be quadruple certain - is it mayhaps Triad Wars
Your deduction method is perfect (no jokes here).
I thought that there are only 3 or maybe 4 games like Hotline Miami at the moment (and probably only 1 with Asian protagonist), was I wrong?
The last screenshot is from actual gameplay, but I specifically took the one from 3rd person perspective for *fun* (my bad).