Insane Mother
Set in the early 1900s, this is the story of a mentally challenged woman who is protected by a lonely man whose mother wants a grandchild.
Starring Odonchimeg Ishdorj, Barkhuu Turbat
Watch "Insane Mother" on Tubi TV released in 2018. It's a drama movie, and has a rating of 8.2 out of 10 from Imdb which is very high for this kind of movie, and is currently available to watch for free.