BE:FIRST / Mainstream -Music Video- | REACTION

BE:FIRST / Bye-Good-Bye -Music Video- | REACTION

BE:FIRST / Mainstream -Music Video- Reaction... THEY ARE SO CREATIVE!!

BE:FIRST / Mainstream -Dance Practice- | REACTION

BE:FIRST / Mainstream -Music Video- Reaction

【BE:FIRST】衝撃の新曲Mainstreamを完全初見リアクション！

Alone with God : Instrumental Worship & Prayer Music With Scriptures & Autumn Scene 🍁

BE:FIRST / Mainstream -Music Video- REACTION

驚愕の世界観にKOされました...。世界に証明した日本発の新しい時代！！BE:FIRST / Mainstream -Music Video- 解説＆リアクション！

BE:FIRST / RYUHEIの書道教室 w/ MANATO & SOTA [BTO #8 "Dig deeper into RYUHEI”] REACTION (ENG/JPN SUBS)

BE:FIRST / Mainstream (Music Video) REACTION

FIRST TIME REACTING TO BABYMONSTER | DRIP, SHEESH, FOREVER BATTER UP & MORE!

BE:FIRST / Move On -Live from “FIRST” One Man Show -We All Gifted.- | REACTION

BE:FIRST 「Mainstream」スゴイ時代が来また！東京から世界へ！【Music Videoリアクション】

THIS IS A MASTERPIECE!!! BE:FIRST - Smile Again / THE FIRST TAKE | (REACTION!!!) 💙😤🔥

Rapper Reacts to BE:FIRST - Mainstream Music Video | First Time Reaction!

過去最高規模!!BE:FIRSTが革命を起こす衝撃作を歌好き男子が全力初見リアクション!!【BE:FIRST / Mainstream -Music Video-】

BE:FIRST / Mainstream -Dance Practice- REACTION (ENG/JAP SUBS)

BE:FIRST / Mainstream -Music Video- | Reaction リアクション @BEFIRSTOfficial【BE:FIRSTリアクション動画】

THEY'RE BACK!!! | BE:FIRST / Mainstream -Music Video- | REACTION

BE:FIRST / Mainstream -Music Video- | First Time Hearing/Reaction