The girl's mother and the boy's father eloped,
The girl's father took his anger out on the boy's mother and drove their orphaned and widowed mother out of the house, living on the streets...
That night, the girl committed suicide by jumping off the building because her mother had taken her younger brother without her when she left. However, she was rescued by the boy...
Ten years later, when the two were studying in the same high school, they remembered what happened when they were children, which led to an inexplicable marriage...
As a child, girls are eight years old and boys are seven.