The Age of Blood
역모 - 반란의 시대 (original)
Kim-Ho is a dutiful swordsman. But after he loses a battle, he’s demoted to the role of prison guard, which is more difficult than he imagines.
Starring Jung Hae-in, Kim Ji-hoon, Kim Ji-hun, Lee Won-jong, Jo Jae-yoon, Hong Soo-a, Hong Soo-ah, Ryu Tae-joon, Hong Seung-jin, Kwon Hae-sung
It's a action & adventure and drama movie, and has a rating of 5.6 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from Finland.