Arang and the Magistrate S01E15 - My mother is a monster??

Eun Oh is surprised to find his mother in the shrine. Moo Young attempts to end his sister's life but is stopped by Eun Oh, who protects her thinking she is his mother. Moo Yeon escapes leaving them with her demons. Confused Eun Oh goes to Lord Choi for an explanation about his mother, Lord Choi tells Eun Oh that he has nothing to do with her evil doings. Eun Oh comes to the conclusion that his mother's body is being possessed by a "monster" and is determined to find out the truth behind it.