I personally didn't watch this drama for months just watching it's trailer or some short videos of it on YouTube.
But I wasn't able to move on from Healer, So I decided to give it a chance, and then fell totally in love with JeChangWook's action/thriller genre of acting.. Since then, I only watched "kill it", Vincenzo and "My Name" to be coming near to it's standards...Don't listen to the Trashy comments up there I am already disappointed a lot in people's taste when it comes to overhyping stupid romcoms and lovey-doveys, sugar-boys etc. etc... If you want some sweet love.. go watch "True Beauty", "Revenge Note" ,"Suspicious Partner", "Backstreet Rookie", "Love020", "King's Avatar" … These are all under-rated but deserved to be on top of list followed by action/thriller genre K2, Healer, Vincenzo, Kill It, Zombie Detective, Fabricated City(Movie) etc...
Since topic was K2, It's totally yes drama, Worth Watching with cool dashy scenes, if you ask a 21 year old how he feels about it, It's a one in a 100 dramas! Don't worry I am not among those people who just watch everything in blind queue.. I have keen thirst for Well-Made, Well-Directed, Well-Acted Dramas.. Hope this helps!