Sun is the story of a little boy and his mother. The child is the result of a drunken roll in the hay the mother has after a fight with her family. Filled with shame and guilt, the mother is incapable of showing the child love and affection. Her father, the boy's grandfather, sees the boy as the son he never had and the heir to his fortune. He takes care of the boy and the bond between the two grows very strong. But the day comes when grandfather dies. In an effort to get rid of the boy, he is told to take his demented grandmother for a stroll. And that's when the accident happens. The boy is charged with murder and ends up in jail. The mother is relieved to be rid of him and shows no intent to defend him. And that's when the boy's father shows up. The mother had bribed him to keep his mouth shut, but he cannot fail his son now. He helps the boy escape, but the police catch up with them. Will they get away?