I did this tab by ear, it's pretty accurate, hope you guys enjoy it!

[Verse]
               B                        C#m
nae mal deureo jullae amu maldo haji malgo
                    E
na sasireun neomuna buranhae

nega eobtneun haru
F#
eotteoke gyeon dilji jeongmal molla

B                          C#m
uri kkeuti anira neun geol ara
               E
naega eobtneun binjarie 
F#
honja apa ulji neun ma


[Chorus]
            B                   C#m
nae mamsoge ojig neo ne mamsoge ojig na
            E
seoro dalma ganeun moseubi
        F#
sarange ppajyeo itdaneun geot
              B                     C#m
gateun haneul dareun got urin jamsi tteoreojyeo
       E                        F#        B
jigeum i sungan yeongwonhi itji malgo gieokae



[Verse]
                B                         C#m
naege boyeo jwotdeon ne sarangeul gieoghalge
                     E
geu nugudo daesinhal su eobtneun
                      F#
dan hanaui sarang nae gaseum gipi neol dama dullae
B                      C#m
orae gidarige haeseo mianhae
                 E
nae pyeongsaenge hanappunin
F#
neoneun jeongmal teugbyeorhan geol


[Chorus]
            B                   C#m
nae mamsoge ojig neo ne mamsoge ojig na
      E
seoro dalma ganeun moseubi
        F#
sarange ppajyeo itdaneun geot
              B                     C#m
gateun haneul dareun got urin jamsi tteoreojyeo
       E                        F#
jigeum i sungan yeongwonhi itji malgo gieokae


[Rap]
B                               C#m
sasil neodo alji neo geurae nan neo animyeon

andwae neodo na animyeon an dwae
        E
ne saenggake jjijeo jineun gaseum gipeo jineun
         F#
hansum nuga geurae chacheum chacheum

na ajil georan mal ppun
B
saranghae saranghae saranghae neo deudji motaedo
C#m
mianhae mianhae mianhae huhoe seureob gedo
E                                    F#
F.O.R.E.V.E.R. ne son jabeulge cheot nune kkojhin

geunal cheoreom uri sai saero gochim


[Bridge]
C#m             E
Be my love. (I) Need you, girl.
     B                         F#
ojig naege neun neo ppuniya neodo aljanha
C#m
chagaun barami
             E
bureo omyeon sonkkeute seuchineun
             B                     F#
geu neukkimi ne gyeote neul itneun geol

             B
nae son jaba judeon
                 C#m
neo bal matchueo geoddeon na
             E
dasi neoreul mannal geunaren
          F#
ne du son nohji anheul geoya


[Chorus] Note: Key changes from B to C
            C                   Dm
nae mamsoge ojig neo ne mamsoge ojig na
            F
seoro dalma ganeun moseubi
        G
sarange ppajyeo itdaneun geot
              C                     Dm
gateun haneul dareun got urin jamsi tteoreojyeo
       F                        G
jigeum i sungan yeongwonhi itji malgo gieokae



That's it! I don't know the notes for the intro and outro of the song, but with 
the chords it'll be easy to figure out in case you guys want to know. Lyrics are 
not mine, they are from KROMANIZED.