This does not mean that you always did the same job. Remember that the chaebol incorporate many different companies. In fact the corporate culture simply does not allow employees to switch companies. Those who try it are considered disloyal and will be at a permanent disadvantage when it comes to promotions. It's hard to say what happens to those laid off.
Young adults live with their parents until they marry.
They just disappear into their family home. Young women are often pressured by their parents to abandon their careers and get married as soon as possible. If their parents are wealthy, many Koreans try to go overseas to study English or something else with the dream of working for a foreign company and leaving Korea. I can give you some examples of how older workers are coping with unemployment. He has been doing part-time, temporary jobs and private jobs for cash.