K-pop girl group AOA’s member Seolhyun, also the lead female actress for high-school vampire drama “Orange Marmalade,” introduced a background track for the telenovela Friday. Seolhyun plays the role of Ma-ri, an undercover vampire student living on animal blood. In a previous episode, she had sung a song to a piano arrangement.The song, composed and produced by the professional music director Jung Ye-kyung, was unveiled online at midday on Friday, under a title which translates in English as “It‘s Okay.”In the “Orange Marmalade,” actor Yeo Jin-goo and K-pop group CNBLUE’s Lee Jong-hyun plays the role of a normal student who falls in love with Ma-ri and the vampire boy who warns the two unlikely lovers to stay away from each other.By Lim Jeong-yeo ()