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.

Рин е сестрата на Юзуки от Kimi no Iru Machi и обича да се шегува и дразни другите.