'It's Okay to Not be Okay' Episode 13: Fans wonder if Mun-yeong's life has witches like in 'Wizard of Oz'

'It's Okay to Not be Okay' Episode 13 ended on a shocking reveal as we saw the head nurse Park Haeng-ja (Jang Young-nam) at the Ok Psychiatric Facility drive away from the hospital and she was seen wearing the butterfly pin that originally belonged to Mun-yeong's (Seo Ye-ji) mother. She drew the image of this pin on the mural that Sang-tae (Oh Jung-se) has been painting and she also seems to be the one to have left a message for Sang-tae with a dead butterfly inside. However, what is her connection to Sang-tae and why does it seem as if she knows about Sang-tae's trauma and his and Kang-tae's (Kim Soo-hyun) mother's murder?
Is she really Mun--yeong's mother who has returned after facial reconstruction? However, her voice and even her character traits are nowhere close to that of Mun-yeong's mother and it is this discord that has drawn various fans towards the theory that Mun-yeong's mother and the head nurse could be twins or sisters. For instance, like the Witch of the West and the Witch of the East from 'Wizard of Oz'.
One fan shared on Reddit, "Could the head nurse be Moon Young's mom's sister/twin? Since we know where the mother's body is and it's pretty impossible for a little girl to fish out a corpse from the lake, I think the head nurse is a different individual. Also, her surprise seemed genuine when Moon Young's father confessed and their voices are too different. Maybe they were both raised by an abusive mother and they picked on the behavior? One sister committed the murder and the other wrote about it. I hope the writers take this route so Moon Young gets answers on her mother's actions."
Another fan wrote, "The placement of butterfly pin on the mom and nurse are different. Mom wears it on the right while nurse wore it on left. This is kinda like that book wicked witch of west and in contrast of the east. Since episode 13 was titled 'The father of the tale of two sisters' it made a LOT of sense." To this, another fan responded, "They feel like different people. MY's mom is screwed up and impulsive but the head nurse is more grounded and goal-oriented. And she doesn't display any affection for MY at all. Not even the negative kind. Someone who was that possessive over her daughter couldn't possibly remain so calm in MY's presence unless she had dissociative identity disorder too."
'It's Okay to Not Be Okay' originally airs on tvN on Saturdays and Sundays at 9 pm KST in South Korea and can be streamed on Netflix.