It Was Me.

Mrs. Jiang looked at Tae-Joon and couldn't help feeling apologetic towards him when she saw the way he covered his face with his hands. She felt very sorry for him that he had to deal with a mentally challenged fiancee. 

"The doctor will be here soon," Mrs. Jiang said to no one in particular. 

"What if she is telling the truth?" Tae-Joon asked the one question he didn't want to believe was true. 

"Don't be ridiculous. This isn't some sort of drama or web novel. Things like that do not happen in reality!" Mrs. Jiang said with a shake of her head. She was not going to believe that the lady she had thrown out of the house was her own daughter, Grace. 

"So I thought too until I experienced it and other stranger things. I even saw a ghost or something. Maybe it was just a dream or not. I don't even know what she is," Grace said, making Tae-Joon turn to look at her as he remembered having a similar experience.