4D is Korean slang for someone that has a weird, eccentric persona. They seem to reside in their own Bizarre world, typically behaving unusually or unexpectedly. Aegyo is when an idol functions sweet, typically pitching their voice bigger, speaking in toddler speak, and producing gestures such as poking their cheeks https://kylerlcjct.actoblog.com/29788668/an-unbiased-view-of-member-4d