“The people involved were just trying to help and then the accident happened,” he said.
“He was an adult who made his own decision and joined the trip voluntarily, with the aim to improve his life, earning money to alleviate our poverty.”
Gia said his son had wanted to travel to Britain from France, where he had been living illegally since 2018.
The journey to Britain, where he aimed to look for work in a nail salon, would have cost him around £11,000.
“It has been almost a year but whenever I think about this, it’s still painful,” Gia said.
Luong and the majority of the other migrants came from a handful of poor central provinces, hotspots for illegal migration to Europe.
The lorry carrying the victims – including two 15-year-old boys – arrived on a ferry from the Belgian port of Zeebrugge in the early hours of October 23.
They died from lack of oxygen and overheating, according to post-mortem examinations.
A number of people have been arrested and charged in Britain, France and Belgium in connection with the case, including the driver of the lorry, Maurice Robinson, of Northern Ireland, who has pleaded guilty to manslaughter.
Ronan Hughes, 40, from County Armagh in Northern Ireland, also pleaded guilty to manslaughter last month.