During 'F.T. Island 10th Anniversary Showcase' broadcasted on Naver 'V' Live, Jonghun shared that they were originally planning to do a male duet for the special version of ''Love Sick'' and ''I Hope''. Hongki further revealed that he had Heechul in mind for his duet partner but was rejected.
Hongki explained, "Heechul said he really loves our album so he doesn't want to ruin it. So I said that it'll be alright because he sings well and it's a song that he can have fun with but it ultimately, didn't happen."