TWICE 11th Anniversary Celebration Video

In the Korean comments

One comment reads, in translation, “TWICE are introducing quantum physics, and the explanation of a nuclear model for an atom with one proton is pretty solid.” Another pinpoints “the moment when Tzuyu’s long arms are needed,” offering a very specific detail to watch for without explaining the scene.

What the words mean

“울트둥이들” (ul-teudungideul, our beloved TWICE members) compresses “our” into the casual 울 (ul, casual clipped form of "our") (ul) and uses an affectionate nickname formed from TWICE and the Korean ending 둥이 (dungi). Here it is a warm, playful way of referring to the members, not a literal description.