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JunDa is short from JUNno (Junnosuke Taguchi) and UeDA (UedaTatsuya). Both are the members ofJapanese Boyband, KAT-TUN.
They both known as UedaGuchi in Japanese fandom.
Taguchi/Junno is the most KY member in KAT-TUN, that's why most members love to bully him. BUT, somehow Ueda is the least (or never) one to bully him, even there are some times that Ueda almost laughing to hear some of Junno's (cold) jokes. That's why Junno likes to be around Ueda. He even said that, "We pretty much know each other's hesitant moments. So in terms of getting along together... Not a Problem! (smile)"
Junno always called the older members of KAT-TUN (Nakamaru, Akanishi, Ueda) with a -kun suffix after their name to show the respect for them. He used to call Nakamaru with "Nakamaru-kun" and Akanishi with "Akanishi-kun". But, somehow he make a new name for Ueda. He never call Ueda with Ueda-kun, but "Uepi" instead.
As for Ueda, he likes to be around Junno because Junno is so cute. He always smiling no matter what, and he hardly get angry or annoyed to anyone. He even said that he wants Junno as his lil brother (Ueda is a youngest brother in his family).
He had said that he would always stick with Junno whenever he feels doesn't like to talk too much or angry to anyone. He will just sit beside the tall lad (Junno), and he will calm down by himself. Ueda said, "Taguchi is the most easy going person to me" Maybe that's why he did that :)
At some making of PV, we can see these two guys will just sit together watching their friends playing something-silly, or they will just talking to each other, not knowing people around them. Totally drowning into their own world, like this one
They both known as the most childish one in this group. So selfish to others. But, somehow, Ueda said that Junno is more selfish than him. He even often said "You're selfish, you're selfish~" to Junno.