My previous answer was wrong. In the 37th episode of " Rainbow Romance ", when Enfei confessed to Kibum, she did not say " I am the orange girl " but " You are the orange boy." This meant that in the story of Rainbow Romance, Enfie and Kie-bum were lovers. She thought that Ki-bum fit her definition of the adjective 'orange' because he had a distinct personality and passion, as bright and energetic as orange. The way this sentence was expressed might be confusing to some people, but in general, its meaning was to express Enfei's feelings for Kie-van and that Kie-van was unique and special to Enfei.