Romanized:

(with individual parts)

[Hyorin] Oh I swear
Oh I swear (promise you baby)
[Soyu] Kkok matchwonoheun deutan uri dul sai
[Hyorin] Oneureul nochimyeon huhoehalgeol ara I swear

[Hyorin] I I swear yeonghwa sok gobaekcheoreom
Jjinhage ne beonjjae songaragui
D.I.A on sesangi neol jiltuhage hae

[Dasom] I I swear jeo byeoreul ttaseo naege angyeojwo
Jageun nongdameun gwiyeopge bwajwo
Baby I only wanna be with you
([Hyorin] I swear I swear I i swear)

[Soyu] Byeonhaji annneun geon
Nae maeumeul deohaneun geot
[Hyorin] Neoege manheun geoseul
Wonhajido annneun geot
[Soyu] Uri dulman saranghada
Hamkke nuneul gamneun geot
[Hyorin] Nan geugeo hanaya geujeo geugeo hanaya