Picture is not mine. Got it from Google :)

Legend:
Bridge
Chorus
Rap

ROMANIZED

Dareun namjaye soneul jabado ajikdo (want you back)
Amu maldo hal suga opda nan ijen nam (want you back)
Nal ttonan niga dareun namjaga seng gyotda (now it's over but I'm still your lover)

Jiwoboryoyaman he ijoyaman he
Jonhwagireul deurotda gorotda malda
Noryok hebwado nugul mannado soyongi opgo
Nuneul gamgo senggakhebwa I don't wanna let you go

Ne oreusonen hangsang ne jageun soneul japgo gotgon hesso
Ijeun dareun sarampum aneso ne yojaga so isso (want you back girl)

(Want you back girl) do nega do jal halge
(Bad girl) do noege da hejulge
(Oh no) oh michigetda no tteme
Jiwodo ijodo ojjol suga opjana

Na gateun namjaneun obso what you waiting for

Haru yol du bondo do nowa gotdon gorireul senggakhe
Nunbit are kkaji chan nunmuri nohante dachi mot-hago jungbal he
Iron nareul arabwa uri irom andwejana
Ne yopen na ne yopen no jana but now
Odi ganeunji modu kkum indeut-he i malkkaji

Nal barabodon du nun dareun sarameun bojima naman bwa
No obsin michyoganabwa niga piryohe dorawa (want you back girl)

(Want you back girl) do nega do jal halge
(Bad girl) do noege da hejulge
(Oh no) oh michigetda no tteme
Jiwodo ijodo ojjol suga opjana

Dorawa ne mam boini ne mami deullini
Ne gyote non imi tto naga opjana

(Want you back girl) do nega do jal halge
(Bad girl) do noege da hejulge
(Oh no) oh michigetda no tteme
Jiwodo ijodo ojjol suga opjana

TRANSLATION

Even if you hold someone else's hand I still (want you back)
I can't say anything now I'm a stranger (want you back)
You left me and now you have a new man (now it's over but I'm still your lover)

I need to erase I need to forget
I pick up the phone calling and hanging up
No matter how hard I try no matter who I meet it's no use
Close my eyes and think I don't wanna let you go

I always walked with my right hand holding your small hand
And now my woman is in some other man's embrace (want you back girl)

(Want you back girl) I'll treat you better
(Bad girl) I'll do everything for you
(Oh no) Oh you drive me crazy
I try to erase