Beatrice

Beatrice is Mr. Yujin's lover, and also an anatomical skeleton.

Mr. Yujin describes Beatrice as bearing the name of an old noble family that traced back to the middle ages, and that she is an honest and lovely girl who knows how to show her mind. He shows affection to her as if she is a real person. Once, he gets frustrated with Eri for addressing her as just a skeleton who shouldn't be as high maintenance as a human.