Not every kid is born in happy family full of love, not every kid is that lucky. Little David was one of those who had bad luck, who was not born under lucky star.
His mother passed away during childbirth and his father didn't know how to deal with it so he started drinking. Since he became alcoholic he got fired and barely had money to raise little boy David. Disappointed in his life he decided to rob a bank to get enough money to start a new life somewhere else with his son David but unfortunately he got killed in gun fight with police.
David became orphan at the age of 3.

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David spent 1 year in orphanage before he found new family.
But it was not the end of David's problems. The family he got into was his worst nightmare. His stepmother and stepfather were psychopaths who was beating him everyday and forcing him to do hard physical work. Little kid like David was not able to defend himself or do anything to stop them from doing that.
HIs body was very weak, he had diabetes , anemia and weak immunity.
He was suffering for 10 years and things were being worse and worse for him. His body was not able to defend himself but his brain was developing defence mechanisam over that 10 years of torture.

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His brain developed multiple personality disorder, so he was 2 persons in 1 body. 
David -  weak, frightened, anxious and Davidus - strong, handy, determined and extremely smart. Davidus had sharp vision and improved senses,he didn't suffer from  diabetes , anemia and weak immunity, he was cold blooded and immune to everything.
While his parents force him to do hard work or when they were beating him he turend into Davidus and didn't feel any pain, in that state he was that strong  that he could fight back and win but he had different plan so he waited.

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He invented many patents and sold them for huge amount of money on the internet, so he bought cameras and filmed what his "parents" were doing to him. He put everything on the internet. Not long after police arrested  his stepmom and stepdad who were sentenced to life imprisonment.

David later got rid of Davidus and became the man he always wanted to be. Since he was rich he opened world biggest orphanage and helpped thousands of orphans.
He got wife, they made family and lived happly ever after.