Brown Eyed Girls' Narsha and actress Yoo In Na were not able to film for SBS's 'Heroes' on both December 20th and 21st due to personal reasons. Narsha suffered from a high fever and severe cold, while Yoo In Na had an overlapping schedule with the filming for her drama. A representative of Narsha's company revealed to Money Today Star News, "Narsha was not able to make the filming for 'Heroes' because she had a high fever and severe cold symptoms. She took a break and rested at home; her condition has since gotten better." A representative of Yoo In Na's company also revealed, "She was not able to make it because the filming overlapped with her drama filming schedule." Source: Star News via Nate