The King's Letters
나랏말싸미 (original)
Starring Song Kang-ho, Park Hae-il, Jeon Mi-seon, Choi Deok-moon, Jung Hae-kyun, Kim Jun-han, Cha Rae-hyung, Oh Hyeon-Kyeong, Nam Moon-chul, Geum Sae-rok
It's a history and drama movie, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Switzerland.