Responses
Because that is what she meant to do.
.spoiler...
She is a child favored by God and crying is one of her powers. Someone explained it to me because it enhanced her ability. It is empathy which is why she could easily cure the male lead.
Big spoiler
She was originally the character in this story. She sacrificed her life to save asef originally when she was younger and her father was a good guy. Asef was originally hers but because she died for him he loved the person closest or most similar to her, her twin sister.
Since he was tampered with devilish stuff, his mark was hidden.
all zay knows how to do is CRY