I got interested because of the movie title and it showed how he loves his son and he has a lot of patience to that spoiled and disrespecting son. I was touched on the death scene and how he cried. Good acting on that part. I also thought that this would be a heartfelt movie because of what happened to Robin's death in real life.
What I don't like is why would he start to do some writings and pretend it's a suicide letter from his son that made all the people believed and gave them inspiration in life to live, make his writings appreciated and becomes popular then in the end he will just admit that he faked it. Suddenly made him as a bad guy.
That was his chance to be heard, to encourage students to come to his class and learn. Also to give a good memory of his son that was known as a loser. I also don't like movies showing ungrateful children to their parents being disrespectful. It could have been better if the movie showed that his son asked for forgiveness to his father before he died.