About
Mio is one of Dongtae's classmates that became a Dicer in the chaos of Byungchul's death. Morally, Mio is similar to Dongtae: she believes Dice are valid ways for people like them to improve themselves and pursue happiness, and has not yet been seen pursuing quests that are detrimental to other people, although what she actually did to obtain so many Dice as to change herself completely has not been shown either.
(Source: Dice Wiki)