Simply for me its the worst movie of Bong Joon ho. Plot has a multiple and serious goofs and all the screenplay seems to be a pretension for the director/writer to express all of his ideas about injustice and cruelty of modern Korea and of course the world. In order to do that in good cinematic manner, a writer should first write a good screenplay that the plot twists come from the characters and believable situations and then the director visualizes it in his point of view to accomplish his ideas, something we saw in great Ken Loach movie, "I, Daniel Blake".I exampled this movie because it has same theme about injustice. Of course Bong Joon ho is a great writer/director and i love "Memories of Murder","Mother" and "Snowpiercer", but after seeing this movie i was disappointed,as simple as that!