Treeless Mountain. 
A story of two sisters, who at a very young age, must deal with their mother’s abandonment, while being cared for by relatives who just, well, can’t or won’t.
Although few details emerge as to where their father is, where their mother goes, and if she ever comes back, the focus is less on plot than the necessary growing up a child must inevitably face in such circumstances.
The ending is something you might not hope for, but you will walk away knowing that it is the only one that is truly in the best interests of these two siblings. Be prepared to come to terms with your own abandonment issues. Written and directed by So Yong Kim. Please see it.