[Refrain: All]
La, la, la-la-la, la, la, la, la
La, la, la-la-la, la (Hey, hey)
La, la, la-la-la, la, la, la, la, la
[Verse 1: Kim Hee Soo]
Gieokani byeori yunanhi
Keuge tteotdeon geunal
Sangsangdo mot haetji uriga
Mannage doel juriya
[Post-Verse: Jang Hyoun Joon, Park Ha Yu Chan]
Naega dagagado nollaji ma aniya
Sasil nollajwosseumyeon hae
Pureunbicheuro muldeulge doel geoya
Uriga mandeul happy virus
[Pre-Chorus: Choi Han Bin, Thanatorn]
Nal kkeonaen byeolbit geu yeope neokkaji
Wanbyeokan sungan
Neul geudaero isseo jwo nan
Byeonchi ana
[Chorus: Kim Hee Soo, Thanatorn]
Bombaram bol ttae uri dasi manna
I jari i sigan hyanggikkajido
Yeongwonhi ganjikalge gieokae
Happy, happy birthday (Go)
[Refrain: All, Kim Hee Soo]
La, la, la-la-la, la, la, la, la
La, la, la-la-la, la (Hey, hey)
La, la, la-la-la, la, la, la, la, la
Happy birthday
[Verse 2: Jang Hyoun Joon, Choi Han Bin]
Nega ogi jeon haru jongil
Nan kkumman kkueotji
Ijeneun junbidwaesseo modureul
Nollage hal geoya
[Post-Verse: Park Ha Yu Chan, Kim Hee Soo]
Naega dagagado nollaji ma aniya
Sasil nollajwosseumyeon hae
Pureunbicheuro muldeulge doel geoya
Uriga mandeul happy virus
[Pre-Chorus: Choi Han Bin, Park Ha Yu Chan]
Oh, pyeolchyeojineun yeppeun kkochipkkaji
Wanbyeokan sungan
Neul geudaero isseo jwo nan
Byeonchi ana
[Chorus: Thanatorn, Kim Hee Soo]
Bombaram bol ttae uri dasi manna
I jari i sigan hyanggikkajido
Yeongwonhi ganjikalge gieokae
Happy, happy birthday (Go)
[Refrain: All, Thanatorn]
La, la, la-la-la, la, la, la, la
La, la, la-la-la, la (Hey, hey)
La, la, la-la-la, la, la, la, la, la
Happy birthday
[Bridge: All]
Happy, happy birthday
Happy birthday
Happy, happy birthday
Happy birthday
[Chorus: Kim Hee Soo, Thanatorn]
Bombaram bol ttae uri dasi manna (Oh)
I jari i sigan hyanggikkajido
Yeongwonhi ganjikalge gieokae
Happy, happy birthday (Go)
[Refrain: All, Kim Hee Soo]
La, la, la-la-la, la, la, la, la
La, la, la-la-la, la (Hey, hey)
La, la, la-la-la, la, la, la, la, la
Happy birthday