In one review there is a comment to the effect of how sad it is that Koreans still dump unwanted children.
That person hasn't lived in a big enough world. Children worldwide, no matter which nation, suffer many types of abandonment and betrayal from those they consider to be their family, loved ones, carers.
And this is one type of story of such abandonment.
Sent to live in an orphanage with a view toward being adopted to a new family, most likely overseas into an entirely different culture, a little girl believes her father will always come back for her. But as so often happens and in some nations, yes, more than others, she is the unwanted child, the older child from another mother - and also a female, and father now has a new wife and a new baby - could I venture to guess, a boy?
The strikingly excellent acting from the young actress in the lead makes you believe you are seeing all those emotions and that searing pain of abandonment, from endless tears, disbelief, rage in reality, not just a movie.
She fights for herself, though. She doesn't give up although it appears she will. But from any child where the pain of abandonment and betrayal from those who you entrust to love and care for you, this film will resonate and possibly bring forward some real anxiety and memories that are unwanted. An excellent film very well done.