Annoyingly, there's two bands called BigBang; one Nowegian and one Korean... This song 
is from the KOREAN band!
Listen to the song for strumming. IMPORTANT! Sometimes a 2nd guitar comes in
My first tab - don't kill me!
Enjoy! :)

=============================================================================

BIGBANG ft. NO BRAIN - Oh My friend
Tuning: Standard           Chords: Whole song: A-B-D-F
                                   Chorus: A-Ab-B-E-D-F

Symbols: ~ Let ring          * Palm mute
         ||o o|| repeat      / Slide down
         S Slide up          hhammer (x2444x@1)on

Intro: [00.06-00.19]
e|---------|---------|---------|---------|
B|---------|---------|---------|---------|
G|---------|---------|-7~------|---------|
D|-7~------|-4~------|-5~------|-3~-----3|
A|-7~------|-4~------|-5~------|-3~-----3|
E|-5~------|-2~------|---------|-1~-----1|

Verse: [00.20-00.46]
e|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|---------------------------------7-7-7-7-7-7-7-7-----------------|
D|-7-7-7-7-7-7-7-7-4-4-4-4-4-4-4-4-7-7-7-7-7-7-7-7-3-3-3-3-3-3-3-3-|
A|-7-7-7-7-7-7-7-7-4-4-4-4-4-4-4-4-5-5-5-5-5-5-5-5-3-3-3-3-3-3-3-3-|
E|-5-5-5-5-5-5-5-5-2-2-2-2-2-2-2-2-----------------1-1-1-1-1-1-1-1-|

e|-----------------------------------------------------------------|
B|-----------------------------------------------------------------|
G|---------------------------------7-7-7-7-7-7-7-7-----------------|
D|-7-7-7-7-7-7-7-7-4-4-4-4-4-4-4-4-7-7-7-7-7-7-7-7-3-3-3-3-3333333-|
A|-7-7-7-7-7-7-7-7-4-4-4-4-4-4-4-4-5-5-5-5-5-5-5-5-3-3-3-3-3333333-|
E|-5-5-5-5-5-5-5-5-2-2-2-2-2-2-2-2-----------------1-1-1-1-1111111-|

Chorus: [00.47-01.13]
e|---------------------------------------------------------------------------------|
B|---------------------------------------------------------------------------------|
G|-----------------------------------------7777-7777-7777-7777---------------------| x2
D|-7777-7777-7777-6666-4444-4444-4444-2222-7777-7777-7777-7777-3333-3333-3333-3333-|
A|-7777-7777-7777-6666-4444-4444-4444-2222-5555-5555-5555-5555-3333-3333-3333-3333-|
E|-5555-5555-5555-4444-2222-2222-2222-0000---------------------1111-1111-1111-1111-|

Verse 2: [01.13-01.40] x2
e||--------------------||--------------------------------------|
B||o------------------o||--------------------------------------|
G||--6-4/6-7-6-4-6-6~--||-7-6/7-9-7-6-7-7~--7-6/7-11111111-9-7-|
D||--------------------||--------------------------------------|
A||o-4-2/4-5-4-2-4-4~-o||-5-4/5-7-5-4-5-5~--5-4/5-8-8-8-8--7-5-|
E||--------------------||--------------------------------------|
                       x2
e||--------------------||------------------------------------|
B||o------------------o||------------------------------------|
G||--6-4/6-7-6-4-6-6~--||-7-6/7-9-7-6-7-7~--7-6/7-11111111-9-|
D||--------------------||------------------------------------|
A||o-4-2/4-5-4-2-4-4~-o||-5-4/5-7-5-4-5-5~--5-4/5-8-8-8-8--7-|
E||--------------------||------------------------------------|

Gt2: (2nd only)
e|------------------------------------------------------------------|
B|------------------------------------------------------------------|
G|---------------------------------7-7-7-7-7-7-7-7------------------|
D|-7-7-7-7-7-7-7-7-4-4-4-4-4-4-4-4-7-7-7-7-7-7-7-7-3-3-3-3-3333333S-|
A|-7-7-7-7-7-7-7-7-4-4-4-4-4-4-4-4-5-5-5-5-5-5-5-5-3-3-3-3-3333333S-|
E|-5-5-5-5-5-5-5-5-2-2-2-2-2-2-2-2-----------------1-1-1-1-1111111S-|

Chorus: [01.41-02.08]
e|---------------------------------------------------------------------------------|
B|---------------------------------------------------------------------------------|
G|-----------------------------------------7777-7777-7777-7777---------------------| x2
D|-7777-7777-7777-6666-4444-4444-4444-2222-7777-7777-7777-7777-3333-3333-3333-3333-|
A|-7777-7777-7777-6666-4444-4444-4444-2222-5555-5555-5555-5555-3333-3333-3333-3333-|
E|-5555-5555-5555-4444-2222-2222-2222-0000---------------------1111-1111-1111-1111-|

Bridge: [02.08-02.28]
e|-----------|---------------------------------------------------|
B|-----------|---------------------------------------------------|
G|-----------|-------------------------------7777-7777-7777-7777-|
D|-7-7-7-7-4-|-4--2--7-7-7-7-4-4-4-4-2-2-2-2-7777-7777-7777-7777-|
A|-7-7-7-7-4-|-4--2--7-7-7-7-4-4-4-4-2-2-2-2-5555-5555-5555-5555-|
E|-5-5-5-5-2-|-2--0--5-5-5-5-2-2-2-2-0-0-0-0---------------------|

Pre-Chorus: (Oh oh~) [02.28-02.55]
e|---------------------------------------------------------------------------------|
B|---------------------------------------------------------------------------------|
G|-----------------------------------------7777-7777-7777-7777---------------------|
D|-7777-7777-7777-6666-4444-4444-4444-2222-7777-7777-7777-7777-3333-3333-3333-3333-|
A|-7777-7777-7777-6666-4444-4444-4444-2222-5555-5555-5555-5555-3333-3333-3333-3333-|
E|-5555-5555-5555-4444-2222-2222-2222-0000---------------------1111-1111-1111-1111-|
PM **** **** **** **** **** **** **** **** **** **** **** **** **** **** **** ****

e|--------------------------------------------------------------------------|
B|--------------------------------------------------------------------------|
G|-----------------------------------------7777-7777-7777-7777--------------|
D|-7777-7777-7777-6666-4444-4444-4444-2222-7777-7777-7777-7777-3333-3333-3~-|
A|-7777-7777-7777-6666-4444-4444-4444-2222-5555-5555-5555-5555-3333-3333-3~-|
E|-5555-5555-5555-4444-2222-2222-2222-0000---------------------1111-1111-1~-|
PM **** **** **** **** **** **** **** **** **** **** **** **** **** **

Gt2
e|--------------------------------------------------------------------------|
B|--------------------------------------------------------------------------|
G|-----------------------------------------7-7--7-7--7-7--7-7---------------|
D|-7-7--7-7--7-7--7-7--4-4--4-4--4-4--2-2--7-7--7-7--7-7--7-7--3-3--3-33-3~-|
A|-7-7--7-7--7-7--7-7--4-4--4-4--4-4--2-2--5-5--5-5--5-5--5-5--3-3--3-33-3~-|
E|-5-5--5-5--5-5--5-5--2-2--2-2--2-2--0-0----------------------1-1--1-11-1~-|

Chorus: [02.55-03.20]
e|---------------------------------------------------------------------------------|
B|---------------------------------------------------------------------------------|
G|-----------------------------------------7777-7777-7777-7777---------------------|
D|-7777-7777-7777-6666-4444-4444-4444-2222-7777-7777-7777-7777-3333-3333-3333-3333-|
A|-7777-7777-7777-6666-4444-4444-4444-2222-5555-5555-5555-5555-3333-3333-3333-3333-|
E|-5555-5555-5555-4444-2222-2222-2222-0000---------------------1111-1111-1111-1111-|

e|--------------------------------------------------------------------------|
B|--------------------------------------------------------------------------|
G|-----------------------------------------7777-7777-7777-7777--------------|
D|-7777-7777-7777-6666-4444-4444-4444-2222-7777-7777-7777-7777-3333-3333-3S-|
A|-7777-7777-7777-6666-4444-4444-4444-2222-5555-5555-5555-5555-3333-3333-3S-|
E|-5555-5555-5555-4444-2222-2222-2222-0000---------------------1111-1111-1S-|

Gt2:
e|-5h7 x29 S-|
B|-----------|
G|-----------|
D|-----------|
A|-----------|
E|-----------|

Both Gts: [03.21-03.24]
e|--------------------|--------|
B|--------------------|--------|
G|--------------------|--------|
D|--------------------|-7-7-7S-|
A|--------------------|-7-7-7S-|
E|--------------------|-5-5-5S-|