A "Big 3" entertainment agency in South Korea, SM Entertainment is a talent empire that embodies its current acronym - "Star Museum." This record company has been the home of many Korean popular music brilliants, such as H.O.T., S.E.S., and Shinhwa. Aside from being known for their artists' out-of-this-world vocal ranges, a report  shows SM Entertainment has popularized a formula for music videos. This box format is argued to be a building block in defining the visuals of K-pop music videos. In a nutshell, "the box" is an easily noticeable technique of filming music videos in "similar-looking enclosed spaces.

https://www.kpopstarz.com/articles/309719/20230211/5-sm-idols-cameos-sm-music-videos-before-debuting-winwin-yeri.htm

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