this has been on my list for awhile. interesting sounding story. not available on other services.
I recognize the Korean actor.
it's a bit of a long one at 2 hours 19 mins but if you like foreign movies you might give it a try.
War, Thriller, Foreign (Korea).
Starring: Choi min-Sik, Directed: Park Hoon-jung.
The 'Korean actor' is Choir Min-sik. Most well known for Oldboy, I Saw the Devil and possibly Lucy in the west. Recently he's been in Exhuma.
As for the movie, it generally has favourable reviews but it has some glaringly rough and frequent Tiger and wolf CGI. If you can live with that and enjoy melodramatic storytelling you might get something out of this