For James Bond, spying was an endless succession of glamorous women and dry martinis, but for a real-life South Korean commando who undertook secret missions in the reclusive North, life was far harder.
Now aged 59 and the father of three daughters, Yoon Kyung-chul spends his days fixing up old bicycles for a charity in downtown Seoul, the South Korean capital.
That is a far cry from the day in 1973 when the 21-year old Yoon was summoned for duty to go and infiltrate North Korea, which is still technically at war with the South.
"It was 4 a.m. and three men in black suits came to my house. I didn't have chance to say a goodbye to my family," Yoon said of the day he was recruited for the South's Headquarters of Intelligence Detachment.
It wasn't an official conscription. Yoon wound up on an isolated mountain without a nametag or badge of rank.
Yoon said many of the men in his new unit were enticed by the 30 million Korean won ($25,148 at today's exchange rate) on offer to join.
The 21-year old was trained in demolition, long-distance hiking, shooting and knife-hurling under tough conditions that he said included beatings for poor performance. He had no idea when he would be discharged.
"There was no leave. For more than six months in a year, dressed in North Korean army uniforms, we were trained. Many people died during the training and many were injured," he said.
Although overt hostilities between North and South Korea were stopped with a 1953 armistice, both sides conducted low-level hostilities. Most recently, the North shelled an island in the South last year.
Some 13,000 men were trained like Yoon through to the early 1990s and more than 7,000 who worked until the early 1970s have been listed as missing or dead, according to government data. Several hundred of them are believed to be in the North.
Out of the commandos, into the fire
When Yoon left the special forces in 1976 after three years' service, he found he could not get a job and, even worse, that his own country was monitoring his activities.
"I was neither a civilian nor a soldier," he said.
A protest movement by the former military agents saw rioting in Seoul in 2002 when several hundred of them set fire to gas canisters, eventually winning compensation and government recognition of their work.
Even so, many people still consider the ex-servicemen to be gangsters or extremists and nicknamed them "canister men".
They still attend protests and the adverse public reaction prompted Yoon and another ex-commando to open a free bicycle repair center, donating the cycles to schools and daycare centers.
Beneath a sign on the wall of his workshop saying "What have I done for the Motherland today?", Yoon and his staff work on the bicycles.
"We said to ourselves, let's not use our fists anymore... Then, we picked up bicycles on streets. Our goal is to donate 600 bicycles next year," he said.
"I need to get rid of my dark past and show something better to my daughters."