So, this is one of the few Korean songs I enjoy. According to such reliable
sources such as the internet, it is sung by ChangMin of "2am" 
and Lee Hyun of "8eight." 
Anyway, it is a pretty easy song to play and there aren't any chords for it yet
so I thought I'd type them up. 
These are the romanized lyrics since I'm not sure if I can post Hanguel.

Please rate my tab!

Standard tuning.  
CAPO on second fret (all chords relative)

D (xx0232@1) G (320003@1) Em (022000@1)Eb (x43121@3)Ab (xx1114@1)F#mE---2---3---0---6---4---1--- (244222@1)B---3---3---0---8---4---1---
G---2---0---0---8---5---1---
D---0---0---2---8---6---3---
A---X---2---2---6---6---3---
E---X---3---0---6---4---1---

Intro:

D,G,Em

Chorus

D (xx0232@1)           G (320003@1)              Em (022000@1)                          D* (xx0232@1)ulgo sipjiman useojuneun geoya neol japgo sipjiman bonaeneun geoya
D (xx0232@1)           G (320003@1)               Em (022000@1)                    Dhwaga (xx0232@1)najiman chamajuneun geoya da aljiman soga juneun geoya
            
            D (xx0232@1)         G (320003@1)         Em (022000@1)            D** (xx0232@1)namjanikka utneungeoya utneungeoya naega namjanikka

Verse 1:

D (xx0232@1)                                G (320003@1)            Emtteonal (022000@1)geomyeon geunyang gaji wen mari manheunji wae nae gaseumman deo 
       Dapeuge (xx0232@1)hae
D (xx0232@1)                                   Gmianhadaneun (320003@1)mal haengbokharaneun mal mwo nollineun geonji
Em (022000@1)                     Dneo (xx0232@1)eobsi eotteoke useurago

Chorus

D (xx0232@1)           G (320003@1)              Em (022000@1)                          D* (xx0232@1)ulgo sipjiman useojuneun geoya neol japgo sipjiman bonaeneun geoya
D (xx0232@1)           G (320003@1)               Em (022000@1)                    Dhwaga (xx0232@1)najiman chamajuneun geoya da aljiman soga juneun geoya
            
            D (xx0232@1)         G (320003@1)         Em (022000@1)            D** (xx0232@1)namjanikka utneungeoya utneungeoya naega namjanikka

Verse 2:

D (xx0232@1)                          G (320003@1)            Em (022000@1)                          Dipjang (xx0232@1)bakkwo saenggakhaebwa niga naramyeon jal garan nae mare neon utgenni
D (xx0232@1)                                Gareumdapgeman (320003@1)jeongmal yeppeugeman chueokhago sipeo
Em (022000@1)                                  Dchameul (xx0232@1)ttae tteona jeongmal ulgi jeone

Chorus

D (xx0232@1)           G (320003@1)              Em (022000@1)                          D* (xx0232@1)ulgo sipjiman useojuneun geoya neol japgo sipjiman bonaeneun geoya
D (xx0232@1)           G (320003@1)               Em (022000@1)                    Dhwaga (xx0232@1)najiman chamajuneun geoya da aljiman soga juneun geoya
            
            D (xx0232@1)         G (320003@1)         Em (022000@1)            D** (xx0232@1)namjanikka utneungeoya utneungeoya naega namjanikka

Interlude

D,G,Em x2

Outro Chorus:

Eb (x43121@3)             Ab (xx1114@1)             F#m (244222@1)                             Ebchameuryeo (x43121@3)haedo nunmuri naneunde haneureun wae iri hwachanghan geoya
Eb (x43121@3)          Ab (xx1114@1)             F#m (244222@1)                          Dnamjara (xx0232@1)haedo ulgoman sipeunde haessareun wae iri ttagaun geoya
         
            D (xx0232@1)         G (320003@1)         Em (022000@1)            D** (xx0232@1)namjanikka utneungeoya utneungeoya naega namjanikka

Enjoy!