On December 24, 2006 Moon married Jang Joon-hwan, Director of cult film Save the Green Planet!. Both Sungkyunkwan University alumni, the two reportedly met when Jang directed her in the 2003 music video for Jung Jae-il's 눈물꽃 ("Flower of Tears"). After suffering a miscarriage in 2010, Moon gave birth to a daughter on August 4, 2011.