In the third season of 'Undercover', the real Zasa was Old Qu. The tattoo on Old Qu's arm was a wolf, and the third season's plot, Dances with Wolves, also hinted at this. Therefore, Old Qu was the real Zha Sa.
Yes, 'Dances with Wolves' is based on a real story. The movie was inspired by the novel of the same name by Michael Blake, which in turn was based on historical events and the relationship between white settlers and Native American tribes in the 19th - century American West.
Well, 'Dances with Wolves' has roots in true history, but it's not a strict documentary. It weaves fictional elements into a backdrop that draws from real-life circumstances.