This is my interpretation of the song Min-sik Choi is playing in the movie I saw the 
devil(Akmareul boatda).
It might not be a 100% correct but i think it's very close to what he plays.



   Am                   C                   G                  Am

E----------------------------------------------------------------------------|
B-----------1--------------------1--------------------------------------1----|
G---------2--------------------0---------------------0----------------2------|
D-------2--------------------2-----------2---------0----------------2--------|
A--0--0--------0--0--2--3--3--------3--3---------2----------2--0--0-------0--|
E-------------------------------------------3--3-------3--3------------------|




In the next part where it's all strumming he just plays Am to an E and switches between them.



That's it, Good luck!