BE:FIRST / Mainstream -Music Video- REACTION

FIRST TIME EVER REACTION TO BE:FIRST (ビーファースト) - Mainstream M/V & Dance Performance |🧊 OOOOOOOOH!

BE:FIRST - Boom Boom Back + Smile Again + Mainstream + MasterPlan Music Video (Reaction)

BE:FIRST / Mainstream -Music Video | REACTION

BE:FIRST x ATEEZ | Hush-Hush MV 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！

Italian Reacts To LVCAS - Intruso (Clipe Oficial) [ Legendado PT-BR ]

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

Reaction Video: BE:FIRST / Mainstream -Music Video-[REQUESTED]

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

Be:First “Gifted” Music Video Reaction!!!

BE:FIRST / Mainstream -Music Video- & -Dance Performance-|REACTION

FIRST TIME REACTING TO BE:FIRST / Mainstream -Music Video-

拝啓 BMSG様この曲のMVはお作りになられますでしょうか。 BE:FIRST / Grow Up【歌声分析】Reaction

BE:FIRST / Mainstream -Dance Performance- REACTION & SOS - GROW UP First Listen (ENG/JAP SUBS)

BE:FIRST / Mainstream (Music Video) | REACTION

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

BE:FIRST - "Mainstream" | REACTION - FIRST TIME Hearing!

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

DANCER REACTS TO BE:FIRST / Masterplan -Music Video- & Dance Performance Video

【異次元】いやマジで？！Mainstreamだけじゃないこっちもヤバすぎるぞ！！ BE:FIRST / SOS 【歌声分析】Reaction