Sando is a bodyguard of an Angyo Onshi. In the series of Shin Angyo Onshi, only three sando has appeared.
Chun Hyang is the sando of Munsu. Originally, she wanted to be Mong Ryong's sando. But, since Mong Ryong is killed, instead, she offered herself as sando to Munsu, which he accepted. As a sando, she has a great swordmanship skill and agility, which greatly help Munsu in his journey.
Hwang's sando is the only beast sando. Its appearance is like a wolf.