Capo 3
The chords are, for the whole song:
     C5   B5  E5   D5  ( G5 )
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
C5                  B5
S.I.S.T-T-T.A.R, Sistar!
                                E5
Baby stop breakin' my heart (oh no)
                              D5
You heard me? No more next time!
                  ( G5 )
I hope you got that boy


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

     C5    D5   B5  E5
e | ---0----1----2----0--- | 
B | ---2----2----0----0--- | 
G | ---0----1----2----0--- | 
D | ---3----0----0----2--- | 
A | ---4---------2----2--- | 
E | ------------------0--- | 

      C5                 D5  
Oo Boy, deo joha jil surok
   B5               E5
Oo Boy apeun nae mameul ani neo
C5                                 D5
Nae mame jageun soksagim , ttaeron nareul boneun ttaddeut han nungil    
B5                     
Geugeo hanamyeon dwe, ojik neoman wonhae
        E5
Ajik do neoman nae mam moreu janha