Lightning will join the women's group Rainbow OST Iron Man since the debut album by EP [Gossip Girl] 2009 years in the music industry, attracting the best sellers 'jisuk' and 'HY' this. It is evaluated that the jisuk rich vocals blend well with the delicate and sad voice of HY as a sweet pop ballad melody lines stand out, I love you on 'Rainbow' unveiled two days. Composed by a team composed shoulder thug getting attention recently appeared in a surprise ending, five, six times in the past, 'Rainbow', which attracted the attention of many viewers, I love you is the song of the pole to the feeling grows more and more hongbin (eastern Oog minutes love will be featured as the theme song behalf line) and fibrillation (sinsegyeong minutes) chest young love story. Iron Man is a pole progresses interested in gaining more I love you on 'Rainbow' is whether the role is noteworthy is that gwichu.