[Verse 1: Taeyeon, Seohyun]
Let's go! ai o osorete
Zutto! ki no nai furi wa
Naze! saguri saguri de
Oh oh ooh oh, oh oh ooh oh

[Pre-Chorus: Sunny, Yoona, Jessica]
Nee haruka naru yume no kanata
Mayui fuan mo kieru senaka
Tsuite ikitai no ni
You bad bad bad boy, you so bad

[Chorus: All, Yuri, Tiffany]
Saigo no koi de ii no?
(Mr.Mr.) motto
(Mr.Mr.) kotoba de dou-dou-dou?
Saisho no ai ga ii no?
(Mr.Mr.) mitsumetara
(Mr.Mr.) kagayaku Eyes

[Post-Chorus: Taeyeon, Tiffany, Seohyun, Tiffany and Seohyun, *Jessica*]
Anata shika inai sekai
Kono hoshi wa Mr.Mr.Mr.Mr
Anata nara wakaru hazu
Sono imi ga Mr.Mr
*Mr. Mr. Mr. Mr. Mr. Mr. Mr. Mr
Mr. Mr. Mr. Mr. Mr. Mr. Mr. Mr*

[Verse 2: Jessica, Tiffany]
Why not? sagashita ai wa
Zutto! koko ni aru no ni
Ima! shinjite hoshii
Oh oh ooh oh, oh oh ooh oh

[Pre-Chorus: Sunny, Sooyoung, Yuri]
Mirai no tobira hiraku kagi wa
Tsunaida te to te karamiatta
Yubi moyou egaku kigou
My mi-mi-mister, rock this world

[Chorus: All, Hyoyeon, Sunny]
Saigo no koi de ii no?
(Mr.Mr.) motto
(Mr.Mr.) taido de dou-dou-dou?
Saisho no ai ga ii no?
(Mr.Mr.) mitsumetara
(Mr.Mr.) himitsu no Eyes

[Post-Chorus: Tiffany, Jessica, Sunny, Jessica and Sunny, *Sooyoung*]
Anata shika inai sekai
Kono hoshi wa Mr.Mr.Mr.Mr
Anata nara wakaru hazu
Sono imi ga Mr.Mr.Mr.Mr
1, 2, 3, 4
Hey, hey, hey, hey
*Mr. Mr. Mr. Mr*
Hey, hey, hey
Wooh~

[Bridge: Sooyoung and Yoona, Taeyeon, Hyoyeon and Yuri, Tiffany]
(Nee ima ijou) anata wa
(Koi suru nante) hontou no
(Mou dekinai wa) anata ni naru
(Mr.Mr.) Mister
(Sakaraenai wa) nee kidzuite
(Unmei no) hikari no wa no naka e
(Nee fumidashite hikari no mirai) Mister wow

[Chorus: All, Jessica, Hyoyeon, Taeyeon]
Saigo no koi de ii no?
(Mr.Mr.) motto
(Mr.Mr.) kotoba de dou-dou-dou?
Saisho no ai ga ii no? (Oh you are)
(Mr.Mr.) mitsumetara (Mr. Mr.)
(Mr.Mr.) kagayaku Eyes (Ooh oh)

[Post-Chorus: Seohyun and All, Taeyeon and All]
Anata shika inai sekai
Kono hoshi wa Mr.Mr.Mr.Mr
Anata nara wakaru hazu
Sono imi ga Mr.Mr.Mr.Mr