This X post from 

@kwih_0
(posted on January 31, 2026) is a fan-recorded video (fancam) of Red Velvet performing "Bad Boy" at the SMTOWN LIVE 2026 concert in Fukuoka, Japan.The clip quickly went viral among K-pop fans, gaining over 59,000 likes, 17,000 reposts, and nearly 1.8 million views within hours. The Korean caption roughly translates to:
"260131 Fukuoka SM con
Red Velvet Bad Boy ㅁㅊ거아니야???? (Isn't this literally insane/crazy????) #레드벨벳 #Redvelvet"
"Bad Boy" (released in 2018) remains one of Red Velvet's most iconic retro-vibe tracks, and this performance captured the group's signature charisma—sharp choreography, powerful stage presence, and stylish black outfits that perfectly matched the song's confident, edgy mood. Fans in the replies and quotes were losing it over the energy, vocals, and visuals, with many calling it one of the highlights of the night.The concert was part of SM Entertainment's big anniversary celebrations (SMTOWN LIVE 2025-26 [THE CULTURE, THE FUTURE]), featuring acts like TVXQ, EXO, NCT, aespa, RIIZE, and more. Red Velvet's setlist that day also included other classics like "Red Flavor" and "Run Devil Run" in some segments.If you're looking for the video itself, it's the attached clip in the original post (a vertical fancam showing the members' intense delivery and crowd reaction). Let me know if you'd like more details about the setlist, other performances from that concert, or similar viral fancams! 😄