After a totally engrossing Season 1 and a very strong Season 2 and a Tragic (with much room to be re written) Season 3; and my strong affinity with 'Kang Center' ; Season 4 is a Flop.
I have never felt so let down with a season which i was waiting to catch with high anticipation.

Main Reason: Logic Failure. The Scriptwriter's apparent and disappointing effort to write a script to grovel and fawn after the 'American LAPD' plot angle. How are American Cops allowed to Run Rampant threatening local Koreans with their Guns & LAPD badges? Giving it a chance and deciding to soldier on to 4 episodes; i really started wishing this LAPD Derek Cho would just get shot in the head to end this series early. Dumb Character by a mediocre actor given a shallow and irrational character. I still like Lee HaNa's Kang KwonJoo. One of the better characters ever developed.