IRIS - 2009 - 7/10
AKA - Airiseu // 아이리스

Convoluted K-drama actioner.
20 interlocking episodes with a cliffhanger or surprise ending each one.
Begins as espionage, gradually the existence of I R I S is revealed.
Conspiracies and plots spread like weeds.
Backstory and relationships are established in the first couple of episodes. By #04, the pedal goes down.

Gunfights galore. Lavish production values, filming sprawled across several global locations.
Unbearable romance elements. (the bane of K-dramas)

I thought this ended at Ep 17, but no, there were still plot twists and fresh narrative.
Wildly popular in Asia, spawned two sequels (mixed reviews there).