Lirik: 서지음
Komposer: Deez, Andrew Choi, Alexander Karlsson, Alexej Viktorovitch
Arranger: Jel

[Hangul]
가사
수면 아랜 바삐 발을 저어도 평화로운 표정 You don’t know
막이 오르기 전 늘 분주해도 네 앞에만 서면 Acting cool

* 은밀하게 지금 벌어지고 있는 일을 너는 모르게 아직 안 돼
적당한 때 그 순간을 노려 네가 눈치챘을 땐 늦어있게

** 까만 그림자가 밤으로 밤으로 스며들듯이
의식 저편을 파고들어 네 안에 Undercover

굳이 큰 액션은 필요 없는 Scene 뭔가 느꼈다면 Kind of love
조그만 속삭임 가끔은 그게 더 강렬한 법일 테니 I want more

은밀하게 지금 벌어지고 있는 일을 너는 모르게 아직 안 돼
적당한 때 네가 감당할 수 없을 만큼 그렇게 원해야 돼

**Repeat

저 거울 속 넌 어느 틈에 나와 같아
그 하모니는 너와 나의 노래
아직은 Undercover 하지만 곧 알아채게 될 걸

*Repeat

나는 흘러 들어 네게로 네게로 스며들듯이
너의 빈 곳을 파고들어 네 맘에 Undercover

**Repeat

Undercover 낯선 내가 보여?

[Romanization]
gasa
sumyeon alaen bappi bal-eul jeoeodo pyeonghwaloun pyojeong You don’t know
mag-i oleugi jeon neul bunjuhaedo ne ap-eman seomyeon Acting cool

* eunmilhage jigeum beol-eojigo issneun il-eul neoneun moleuge ajig an dwae
jeogdanghan ttae geu sungan-eul nolyeo nega nunchichaess-eul ttaen neuj-eoissge

** kkaman geulimjaga bam-eulo bam-eulo seumyeodeuldeus-i
uisig jeopyeon-eul pagodeul-eo ne an-e Undercover

gud-i keun aegsyeon-eun pil-yo eobsneun Scene mwonga neukkyeossdamyeon Kind of love
jogeuman sogsag-im gakkeum-eun geuge deo ganglyeolhan beob-il teni I want more

eunmilhage jigeum beol-eojigo issneun il-eul neoneun moleuge ajig an dwae
jeogdanghan ttae nega gamdanghal su eobs-eul mankeum geuleohge wonhaeya dwae

**Repeat

jeo geoul sog neon eoneu teum-e nawa gat-a
geu hamonineun neowa naui nolae
ajig-eun Undercover hajiman god al-achaege doel geol

*Repeat

naneun heulleo deul-eo negelo negelo seumyeodeuldeus-i
neoui bin gos-eul pagodeul-eo ne mam-e Undercover

**Repeat

Undercover nachseon naega boyeo?

[English]
lyrics
You can not know what to do when you sleep
Acting cool before the climb

* Secretly, you do not know what’s going on right now.
When you’re right, you’ll be late.

** Just as black shadows permeate into the night at night
Outside of consciousness, dig in. Undercover

I do not need a big action Scene If I felt something Kind of love
A little whisper Sometimes it’ll be more intense I want more

You do not know what’s going on secretly yet.
You have to be so desperate that you can not afford it.

** Repeat

You’re in a mirror like you’re in a break.
The harmony is you and my song
It’s still Undercover, but you’ll soon find out.

* Repeat

As I flow into you,
I dig in your empty space and it is in your heart.

** Repeat

Undercover stranger I see?

[Indonesia]
lirik
Anda tidak bisa tahu apa yang harus dilakukan saat Anda tidur
Bertingkahlah sejuk sebelum memanjat

* Diam-diam, Anda tidak tahu apa yang sedang terjadi saat ini.
Ketika Anda benar, Anda akan terlambat.

** Sama seperti bayangan hitam meresap ke dalam malam di malam hari
Di luar kesadaran, gali masuk. Menyamar

Aku tidak butuh adegan aksi besar. Jika aku merasakan sesuatu yang penuh cinta
Sedikit berbisik Kadang-kadang itu akan menjadi lebih intens, saya ingin lebih

Anda belum tahu apa yang terjadi secara diam-diam.
Anda harus begitu putus asa sehingga Anda tidak mampu membelinya.

** Ulangi

Anda berada di cermin seperti sedang istirahat.
Harmoni adalah Anda dan lagu saya
Ini masih Undercover, tetapi Anda akan segera tahu.

* Ulangi

Saat saya mengalir ke Anda,
Saya menggali ruang kosong Anda dan itu ada di dalam hati Anda.

** Ulangi

Orang asing yang menyamar yang saya lihat?