Sin Kim Dan (1938 - ) sprinter.

Dan broke the women’s records for 400m and 800m in 1961/2. She was the first woman to run 400m in less than 52 seconds.

In 1963 in Moscow, other female sprinters refused to run against her because she looked like a man.

A South Korean man claimed that she was his son who had disappeared during the war.

She was not in the 1964 Tokyo Olympics as North Korea was not in the International Association of Athletics Federations (IAAF).

Her record was not passed until 1969, and it still holds in Asia.

Obligatory sex-testing for international athletics was introduced in 1966, and for whatever reason, Sin did not compete after that.

• “Shin Kim Dan”. Wikipedia: Die freie Enzyklopädie. de.wikipedia.org/wiki/Shin_Kim_Dan.