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What happened

BOYNEXTDOOR's Park Sungho spends a whole dance dodging bandmate Lee Han's dropped sunglasses so he won't step on them. The Japanese-captioned short, posted on the group's own channel and tagged with Japanese dance crew AVANTGARDEY (アバンギャルディ) and the track BoomBoomBoom, shows the two groups performing together.

Why Koreans care

The video's Japanese captions ("no rewind," "the end roll isn't the end") mimic the language of anime end credits, which is why one commenter guessed a bonus scene would follow — Koreans call that a 쿠키 영상 (kuki yeongsang, a bonus clip shown after the main content ends), a term borrowed from Marvel movies' post-credits scenes and now used for any extra bit tacked onto a video. Pairing a K-pop act with AVANTGARDEY (アバンギャルディ), a Japanese dance crew one fan specifically flagged as "incredible dancers," reads in Korean fandom as a genuine cross-scene team-up rather than routine promo choreography.

In the Korean comments

Majority: most comments fixate on the sunglasses mishap itself. One top comment: "Sungho: Should I step on it? Nope, not stepping on it. Step on it? Nope — and then he just picks it up in the end, so funny." Minority: a smaller set of reactions ignore the sunglasses bit entirely and focus on appearance. One comment: "Why is Park Sungho's tied-back hair so pretty..." Fandom: others zero in on the collaboration itself, impressed by AVANTGARDEY's reputation. One comment: "Whoa, I knew those people as incredible dancers — and now they got to dance together, haha."

What the words mean

Several commenters jokingly call this the 선글라스 안밟기 대작전 (seongeullaseu anbapgi daejakjeon, "Operation: Don't Step on the Sunglasses"), and a foreign viewer could easily read "operation" as real planned staging. In Korean internet slang, 대작전 (daejakjeon, "grand operation") is a stock hyperbole for any small, accidental moment — fans here are just exaggerating an unplanned mishap, not describing a scripted stunt.