Chris Gunness reports on one of the most vicious colonisations in history: Japanese rule in Korea.

Japan annexed Korea in 1910 - with the approval of Britain and other western powers - and ruled it for 35 years. Japan attempted a cultural genocide. Many Koreans collaborated with their colonial masters, covering up their record after independence. Half a century on, the two countries are on a path of reconciliation. Chris Gunness meets Koreans with vivid memories of the colonial period to find out whether the psychological scars have yet begun to heal.