Who teaches Yunjae about love and beauty in the novel, Almond?

Though Dora does not enter the narrative until midway through the novel, Yunjae suddenly notices her for her strangeness. Though she has friends, she seems disinterested in what others think. Yunjae also likes that she appears comfortable being by herself. After they meet in the school library, Dora begins visiting Yunjae at the bookstore. Gradually, their friendship grows into romantic feeling. With Dora's help, Yunjae learns about love and beauty.