MOVE LIKE #LeejungLee

In the Korean comments

One comment says, in translation, “Leejung and Jaehyun have such strong sibling energy that, without context, you could think they were siblings.” Another says watching the full version showed how much Leejung cherishes and supports Jaehyun.

What the words mean

재현이 연하되는 조합 (Jaehyeon-i yeonha doeneun johap, “a pairing that makes Jaehyun younger”) does not mean his age changes. It is casual fandom shorthand for a dynamic that brings out his younger-guy side; another comment similarly calls his “younger-man vibe” striking.