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Through her Instagram, she posted pics of them together and wrote, "Ayum, Jung Eum." In the picture, they look close and affectionate. In one shot, it looks like Hwang Jung Eum is even going in for a smooch while Ayumi leans in to accept! How cute.
Their group debuted back in 2002 and disbanded in 2006, but it's good to see they're still close.