A joint North and South Korean hockey team is competing in the Winter Olympics - but it isn't the first time the two foes have joined forces.

In 1991, they sent a unified team to the World Table Tennis Championships. That was where South Korean champ Hyun Jung-hwa met the North's Ri Pun-hui.

The two friends led their team to sporting glory and were then separated for ever. This is their story.

Interview by Woongbee Lee of BBC Korean. Video by Jungmin Choi and Tessa Wong.