Song Wongeun, Go Hoonjeong, Lee Choongjoo as Arthur
Hong Ryunhee as Morgane
Kim Chanho, Baek Hyunghoon as Méléagant
Im Byeonggeun, Lee Seungheon as Lancelot
Linzy, Lee Jisoo, Lee Jiyeon as Guenièvre
Ji Hyaegeun as Merlin
The first half of the video is a series of cast interviews led by Lee Jongchan (Gauvain). The rehearsal itself starts at 30:50. Specific song time stamps under the cut.