So gave birth to a baby girl at St. Mary Hospital in Seocho-gu, southern Seoul, after 15 hours in labor, the aide said, adding that "both So and her baby girl are healthy."
Her husband, Baek, was by her side during the whole process, according to the aide.
She gave birth to a boy, her first child, in April 2014. They tied the knot in January 2013.
