Workers from the Korean Confederation of Trade Unions (KCTU) march during a May Day rally in central Seoul May 1, 2013. Thousands of workers who took part in the rally asked for an extensive revision of the labour law and demanded that the government provide temporary workers employment stability by converting their status to full-time workers. REUTERS/Kim Hong-Ji (SOUTH KOREA - Tags: CIVIL UNREST POLITICS SOCIETY BUSINESS EMPLOYMENT)