A beautiful woman with prodigious fighting skill. She acts as Munsu's 'Sando', or bodyguard. When she was kidnapped by a corrupt lord who wanted to make her his personal bodyguard, her lover embarked on a futile quest to become an angyo onshi. He died in the process, but not before making Munsu aware of her plight. After Munsu frees her, she decides to become his bodyguard in memory of her dead lover, and takes the title "Sando" as her new name.
Despite her fearsome natural fighting ability, Sando is quiet and shy, with a high moral stance. As a result, she is often in conflict with the amoral Munsu over his questionable methods. She has made it clear that if he ever becomes truly evil, she will no longer protect him. She also has a great fear of heights, and will refuse to cross bridges set over deep mountain gorges or valleys. Munsu finds this extremely peculiar, seeing as to how she often leaps several stories into the air during combat.
Blade of the Phantom Master translated as "New Royal Secret Commissioner", is a serial comic and animated film created by Youn In-wan and illustrated by Yang Kyung-il. The series takes place in a futuristic world reminiscent of ancient Korea, and follows the Korean-folktale-inspired adventures of Munsu, one of the few remaining guardians against corruption and tyranny, as he seeks to find those responsible for the destruction of his country. It was serialized from 2001 to 2007 in South Korea (as Sinamhaengeosa) and in Japan (as Shin Angyō Onshi), and was adapted into an animated theatrical-release film in 2004 in a first-of-its-kind collaboration between Japan and South Korea. In 2007, an English-language version of the film was released in the United States by ADV Films under the title, Blade of the Phantom Master. In 2008, the anime became one of over 30 ADV titles transferred to Funimation.