[Intro: Jungsu]
Na-na-na-na-na-na-na-na-na
Na-na-na-na-na-na-na-na-na-na
Na-na-na-na-na-na-na-na-na
Na-na-na-na-na

[Chorus: O.DE, Jooyeon, Jungsu & Gaon]
I feel like hwi
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day
Feel like
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day, day

[Verse 1: Jungsu, O.DE, Gaon]
I'm a birthday clown tonight
Ibeun utgo itjiman
Domuji heungi an olla
Dadeul na gateun geot gata
Ttabunhae ttabunhae ttabunhae ttabunhae haam
Kkwak cha inneun bang an
Gongheohan baksu sorie
Chotbureul bureo
Hana dul set hu
Everybody’s missing a thing
Celebration with no feelings
Choga kkeojin dwiedo
Jigeumgwa gateun pyojeongilkka?

[Pre-Chorus: Jooyeon]
Birthday it's your birthday
Teojineun pokjuk sorie mutineun noraetsori
Worst day it's a worst day
Najimaki deullineun gwangdaeui useumsori
Gwangdaeui useumsori

[Chorus: O.DE, Jungsu & Gaon, Jooyeon]
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day
Feel like
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day, day

[Post-Chorus: Jungsu & Gaon & O.DE & Jooyeon]
I'm so sick of the fakes
I'm so sick of the fakes
I'm so sick of the fakes
I'm so sick of the fakes
Run run for your life
Run run for your life

[Verse 2: Jungsu, Gaon, O.DE, Jooyeon]
I remember the day when I was eight
Useum ttawin eopseosseo siktak wie
Malla biteureojyeobeorin keikeu apeseo
Pitgi eomneun ipsullo utgo inne
Ja sumeul goreugoseo
Hana dul set net
Domangchillae nan deo meolli meolli meolli meolli
Everybody blesses me
One thousand meaningless wishes
Choga kkeojin dwiedo
Modu da gateun pyojeongilkka

[Pre-Chorus: Jungsu]
Birthday it's my birthday
Goyohan gonggan soge deullineun noraetsori
Worst day It's my worst day
Ah, ah

[Chorus: Jooyeon, O.DE, Jungsu & Gaon, All]
I feel like hwi
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day
Feel like
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day
Killin' me, killin' me
Killin' me, killin' me

[Bridge: Jun Han, Jungsu]
Mwoga joeunde
We're closer to death
Chagaun jinsiri
Killin' me, killin' me
Killin' me, killin' me, killin' me

[Chorus: Jooyeon, Jungsu & Gaon, O.DE]
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day
Feel like
Tra-la-la-la-la-la-la-la-la-la, ha-ha
Happy death day
Happy, happy worst day, day

[Post-Chorus: Jungsu & Gaon & O.DE & Jooyeon, Jooyeon, Gaon]
I'm so sick of the fakes
I'm so sick of the fakes
Run run for your life
Run run for your life
I'm so sick of the fakes
I'm so sick of the fakes
Run run for your life
Run run for your life