Nguyen Hoang Tam, now 39, was accused of raping his stepdaughter several times between 2021 and 2022.
In 2011, after her father and mother split, the girl stayed with her mother in the city's outlying district of Hoc Mon.
The mother remarried six years later and the stepfather, Tam, came to live with them.
He raped her for the first time in October 2021 when she was sleeping with her mother. The girl was not aware of what happened and only fell hurt in her private part in the morning.
One month later, Tam raped the girl again when the mother was out and threatened to harm her if she dared to tell anyone about it.
In February 2022, Tam picked up the girl at school and took her to a hotel, using force to abuse her again.
Just over a week later, when the event was repeated, the girl secretly made a videotape on her phone and sent it to some friends.
In March, she, then a seventh grader, came to her teacher for help. The teacher reported the case to the school's leaders.
Later that day when Tam arrived at school to pick up the girl, teachers and a guard prevented him from doing so. He fought back and drove the girl away. The school contacted the mother, who then called the police.