Him

The Demon boss' name is not yet clear but mentioned several times.

Sister Krone had a private talk with Norman and Emma then she mentions the Demon's name.

The demonds have a Tifari that offers something to the Demon boss.

If the kids break the Promise, Musica says they'll make an enemy of the Demon Boss. But Sung-joo said that the Demon Boss was their enemy from the vert start.

chapter 48