Capo 3
The chords are, for the whole song:
     C (x32010@1) Bm7 (x20202@1)Em (022000@1) Dm7  (G)
e|---0----2----0----1----3---|
B|---2----0----0----1----0---|
G|---0----2----0----2----0---|
D|---3----0----2----0----0---|
A|---4----2----2---------2---|
E|-------------0---------3---|

Let's go
C (x32010@1)                Bm7S.I.S.T-T-T.A.R, (x20202@1)Sistar!
                                EmBaby (022000@1)stop breakin' my heart (oh no)
                              Dm7
You heard me? No more next time!
                  (G)
I hope you got that boy

And it continues like this
except for the bridge that goes with these chords:

C (x32010@1)  D (xx0232@1) Bm7 (x20202@1)Eme|---0----1----2----0---| (022000@1)B|---2----2----0----0---|
G|---0----1----2----0---|
D|---3----0----0----2---|
A|---4---------2----2---|
E|------------------0---|

C (x32010@1)               D (xx0232@1)
Oo Boy, deo joha jil surok
   Bm7 (x20202@1)             EmOo (022000@1)Boy apeun nae mameul ani neo
C (x32010@1)                               DNae (xx0232@1)mame jageun soksagim, ttaeron nareul boneun ttaddeut han nungil    
Bm7 (x20202@1)                   
Geugeo hanamyeon dwe, ojik neoman wonhae
        EmAjik (022000@1)do neoman nae mam moreu janha

Good Luck :)

Official SISTAR website: http://starship-ent.com/sistar.php