Sha Hai, who is the traitor of the Wangs?

Su Nan, Xia Jun, Su Rige, Shen Qiong. According to the characters in the TV series Sha Hai, Su Nan, Xia Jun, Su Rige and Wang Jia sent undercover. They sneaked into the desert with Ma for different purposes, in order to find out the secret of the bronze mirror, monitor Wu Xie's every move, and report the situation of Wu Xie to the Wangs at any time.