Something was off about her WBK!! Okay now I have these in my mind:
1. Munyoung's mother was really the one who killed the Moon bros' mom. She painted her nails later on, after the killing.
#ItsOkayToNotBeOkay #ItsOkayToNotBeOkayEP13

2. Head nurse Park IS Munyoung's mom who had undergo plastic surgery and make a new identity.
3. Or, she IS NOT Munyoung's mom, but her sister who wants to avenge Do Hwijae's death. #ItsOkayToNotBeOkay #ItsOkayToNotBeOkayEP13

In the preview for next episode, Munyoung said "come to me, Mom." but remember; never trust TvN's previews it may be another mislead or Munyoung doesn't know that her mom has a sister. More on it:
https://twitter.com/nightelle_/status/1288190262577999872?s=21
#ItsOkayToNotBeOkay #ItsOkayToNotBeOkayEP13

Do Hwijae isn't likely to be alive. I mean... she fell hard from 2nd floor that caused her to bleed a lot, and rather than getting treatment she was moved to basement before drowned. No normal human would survive unless she is a literal witch. #ItsOkayToNotBeOkay

4. About the dooly's step mother story. I think it's about the head nurse and Munyoung. Park Haengja places herself as Munyoung's stepmother after Hwijae's death.
#ItsOkayToNotBeOkayEP10 #ItsOkayToNotBeOkay

She believes that after her sister is gone, she needs to bring Hwijae's wish to raise her greatest creation into reality. And to achieve that, she has to get rid of Moon bros from Munyoung's life, just like how Hwijae did back then. #ItsOkayToNotBeOkay #ItsOkayToNotBeOkayEP13

Therefore, she considers herself as the "good stepmom". #ItsOkayToNotBeOkayEP13 #ItsOkayToNotBeOkayEP10 #ItsOkayNotTobeOkay

5. For those who are asking about Park Okran, she's been crossed from Munyoung's mother's list since day 1.

They just made it too obvious in the beginning that she is the real mom. But welp, unmistakably she is not. #ItsOkayToNotBeOkayEP13 #ItsOkayToNotBeOkay

Park Okran is a former theatrical actress. Head nurse Park, who has access to all the patients, must've had manipulated Park Okran and told her to act like that to confuse Munyoung and the others (those notes are the proofs) #ItsOkayToNotBeOkay #ItsOkayToNotBeOkayEP13

She even was so sure that Okran will not come back to the hospital which gives possibility that she might've already gotten rid of her to prevent her from telling the truth. #ItsOkayToNotBeOkay #ItsOkayToNotBeOkayEP13