"The Russian space agency has stressed that a minor mistake and disobedience can cause serious consequences in space," Mr. Lee said at a nationally televised news conference. "So the honor of becoming South Korea's first astronaut now goes to a woman."
First Korean Astronaut Switched to Woman, Korea Times
"A 29-year-old female mechanical engineer was belatedly filled in Monday as the first South Korean in space, after Russia's space authorities dismissed Seoul's original choice on security rule violations ahead of next month's mission. The Ministry of Education, Science and Technology told a news conference that Russia's Federal Space Agency asked for Ko San's replacement, as the 31-year-old repeatedly broke training protocol by taking sensitive training material outside of the Russian space center."