More than 30,000 North Koreans have fled poverty and repression in their isolated homeland to move to the South.
But they often struggle to make a living in the capitalist South and sometimes fail to adjust to their new lives.
Dressmaker Kim Ryon-Hui arrived seven years ago but has since has made several desperate attempts to return to her family -- including forging a passport, for which she was imprisoned, and falsely confessing to espionage in the hope she would be expelled.
"I have been forcefully detained in the South for seven years," she added.
Kim accused Seoul of violating her human rights, saying it had prevented her from going back to her aging parents and daughter.
"A mother is someone who can't be apart from her daughter for even a moment, but seven years just hurts too much," she said, her voice trembling, adding she had attempted suicide.
South Koreans need government permission -- which is only granted in exceptional circumstances -- to go to the North, with which the country is technically still at war.
Pyongyang repeatedly cites Kim's case and has said it will not allow any more reunions of relatives divided by the Korean War until she -- and 12 North Korean waitresses who it says were kidnapped from a restaurant in China -- are returned.
Quintana said the case was an example of the "absurd cost of division".
The North is accused by the UN and many other countries of widespread human rights violations and Quintana said social and economic structures that fulfil ordinary people's rights and needs had largely "disappeared".
"What remains intact is the comprehensive system of control and surveillance over the population," he said.
There was also a "widening gap in living standards between Pyongyang residents and the majority of the population".
"The order of priorities in the DPRK requires a major shift that recognises the urgency to fulfil the basic needs of the population.
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