I'm So Proud of Hae Won as a Child♥︎

In the Korean comments

One top comment reads, in translation, “I saw the thumbnail and genuinely thought it was Haewon as a child,” while another announces the return of the “legendary red-glasses elementary-school Haewon.” A particularly detailed comment flags the covert greeting and childlike nose scratch at 0:15, Haewon cracking up at Lily’s ad-lib at 2:08, a tiny wave toward “Mom” at 4:00, and a detail that makes the staff laugh at 4:39; other comments point viewers to the doll throw at 3:37.

What the words mean

“본체 해원” (bonche Haewon, “the real Haewon”) literally uses “본체” (bonche, main body or main unit). Here it means Haewon herself briefly showing through the schoolchild character when Lily’s ad-lib makes her laugh—a casual fandom expression for the performer beneath a persona.