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English Wikipedia has an article on:

4D (not comparable)

  1. Abbreviation of four-dimensional.
    1. Describes a 3D film experience that is supplemented with synchronized physical effects.
  2. (K-pop, fandom slang) Having a quirky or oddball personality.
    • 2018, ‎Hayley Marland, K-Pop Survival Guide (page 99)
      Being considered 4D is usually when an idol behaves and acts differently or strangely compared to the usual Korean standards.
    • 2021, Entertainment Weekly The Ultimate Guide to BTS:
      If every K-pop group has a “4D” member, V was probably BTS's. He's grown up significantly since then, emanating maturity and wisdom []