[Intro: Kei]
Oh-oh, oh-oh, yeah
Oh-oh, oh
[Verse 1: Hwiseo, Yuki, Yeoreum, Nana]
Aljana igeon destiny (Alright, alright)
Urin geobeopsi seone geolchyeo itji (mwo eottae it don't matter)
Tireul nael sun eopseodo urin nunman bwado aljana
Seorol wanseonghaneun last piece sasil neowa nappuniran geo
[Pre-Chorus: Yeonhee, Kei]
Come on, naege jogeum deo hwipsseullyeodo gwaenchana
Silsuyeodo nan joa seonmyeonghan borderline, geudaero neomeo
Jogeum deo gwagamhi dеo tireul naelkka aseurasеulhangeol
Never nobody knows
[Chorus: Nana, Yuki, (All)]
Neowa na duri undercover
Undercover
Neowa na duri undercover
Undercover (Hey, hey, hey, hey)
You and I, keep it undercover
[Refrain: Yeeun, Kei, Hwiseo]
Na-na-na-na-na-na
Na-na-na-na-na-na, undercover
Na-na-na-na-na-na
Na-na, baby, saeropge tteugeopge undercover
Na-na-na-na-na-na
Na-na-na-na-na-na, undercover
Na-na-na-na-na-na
Na-na, baby, saeropge jjarithae undercover
[Verse 2: Yeonhee, Yeeun, Yeoreum, Yuki]
Can't stop dalkomhan i gamjeong
Maesungan maecho jeoljeran difficult
Jeongdabeun in my mind deoneun
I don't wanna waste my time, yeah
Geunyang ttwieodeureo swim on me
Deouk gipi amudo mot boge
Keep it, run it back, keep it, run it back
Dugeundaeneun simjangsorin uri dulman deullige
[Pre-Chorus: Kei, Nana]
Come on, naege jogeum deo hwipsseullyeodo gwaenchana
Silsuyeodo nan joa seonmyeonghan borderline, geudaero neomeo
Jogeum deo gwagamhi deo gado joa jjaritjjarithangeol
Never nobody knows
[Chorus: Yeeun, Hwiseo, Nana, (All)]
Neowa na duri undercover
Undercover
Neowa na duri undercover
Undercover (Hey, hey, hey, hey)
You and I, keep it undercover
[Refrain: Yuki, Kei, Nana]
Na-na-na-na-na-na
Na-na-na-na-na-na, undercover
Na-na-na-na-na-na
Na-na, baby, saeropge tteugeopge undercover
Na-na-na-na-na-na
Na-na-na-na-na-na, undercover
Na-na-na-na-na-na
Na-na, baby, saeropge jjarithae undercover
[Bridge: Hwiseo, Yeoreum, Yeonhee]
Ajjilhameun du baero igeol jeulgyeo, nan
Umjigineun nundongja bimil sign, yeah, oh, eh-oh
Dulman aneun number, oh, eh-oh
Neowa na duri undercover
[Refrain: Nana, Yeonhee, Yeeun, Yeoreum]
Na-na-na-na-na-na
Na-na-na-na-na-na, undercover
Na-na-na-na-na-na
Na-na, baby, saeropge tteugeopge undercover
Na-na-na-na-na-na
Na-na-na-na-na-na, undercover
Na-na-na-na-na-na
Na-na, baby, saeropge jjarithae undercover
[Outro: Hwiseo, Kei, Nana, Yeeun, *Yuki*]
Aljana yeah, eunmilhan uri sign
Neon ama ama al geoya i ajjilhan saikkaji (Yeah, yeah, yeah, yeah; *Undercover*)
Gwaenchana yeah, uriman aneun secret
Deo gyesok gyesok mandeureo i teukbyeolhan neukkim
Neowa na duri undercover