It is just Ok . . . .

it's a sad movie but good story

It simply fell flat. There was never really an established conflict. The sister was so inconsequential that it would have been a better movie without her. From the opening shot there was a lack of coherency. It consistently felt like the movie simply had nothing to say, just "uhh, yeah, so I guess this happened".

Really good movie but the ending was not good. It ruined a good movie