Earlier we reported a quick video teaser of the upcoming KBS drama Cinderella's Sister. It's now been revealed that a full length music video is currently in the works. The music video will feature Moon Geun Young, Taecyeon, Seo Woo and Chun Jung Myung, the four leads of the drama. This upcoming music video is said to be quite the spectacle and will show a whole new side of each actor and actress. The story is about Cinderella's Sister, Eunjo, who lives a harsh life due to a wicked and neglecting mother. Eunjo spends her time running as she desperately tries to avoid gangsters and does whatever she can to survive; even eating scraps of kimbap on the street. Eventually when someone tries to mess with her, she grabs a beer bottle and threatens people saying, "I'll kill you." During filming, Moon Geun Young had to run through alleys all afternoon. Taecyeon had to swing a baseball bat again and again until his body was pouring with sweat. The director of Cinderella's Sister said, "The first broadcast is in March 31st and around that time, a music video will be released to give more impact on the characters. This music video will also show a side of the actors, actresses and artists in a way that can't be seen often, and some people are calling it a 'blockbuster music video'." The first episode is scheduled to air on March 31st.