Jang Ju Hee Video Mix

Jang Juhee is one of the famous TVXQ female dancers during the Something/Spellbound era.

She became better known as the girl who dances with JYP in Who's Your Mama

According to some searches she debuted in 2007 with a group named SIENNA (시에나). That was their title song:    • Видео  

Now she is in a dance group named Nanaschool (in hangul possibly 나나스쿨) with plenty of other hotties, performing with her in the same stages (like TVXQ's T1story concerts).

She can be found in these MVs (directions as WE see them)

Sunny Hill - The Grasshopper Song (Left of Misung)
Mighty Mouth - Nappeunnom (The girl with the headphones on the right)
2Bic - Love Again (Second dancer from left)
Jo Kwon - I'm Da One
Ailee - I'll Show You (Light blue dress, third from left)
TVXQ - Something (obvious)
TVXQ - Spellbound (obvious)
Ukiss - Quit Playing (The one with Hoon, far left. The MV had no good close ups of her)
Super Junior - Shirt (Right of Ryeowook)
JYP - Who's your mama (I guess by now you know who we are talking about)
BoA - Kiss My Lips (4th from left, right of BoA)

She is also in G-Dragon's Crayon but I can't find her. There is also a slight chance to be wrong about the older MVs.
Her instagram:   / juhee.jang.14  
장주희 박진영 어머님이 누구니 댄서