Group NMIXX appeared on singer Sung Si-kyung's YouTube series 'Sung Si-kyung's Would You Sing' and shared their feelings ahead of their Japan debut. In the video released on the 26th, NMIXX (Lily, Haewon, Sullyoon, Bae, Jiwoo and Kyujin) sang 'ADORE U' and 'Birthday Wish' and chatted with Sung. NMIXX, which made a comeback with its sixth mini album 'Strange Muse' on the 19th, explained that it came back earlier than expected because "we have our Japan debut coming up at the end of the year." When Haewon said she was nervous, Sung encouraged her, saying, "Just keep doing well as you have been." When the members confided that their Japanese is lacking, Sung, who released his first Japanese album in 2006 and has steadily promoted in Japan, advised, "I don't think you necessarily have to be good at it. Japanese fans like seeing effort," adding, "Unlike Korea, where people like to see the finished product, they are moved by watching you improve, so it might actually be a good thing." The members showed their determination, saying, "We can show our improvement better than anyone." NMIXX is currently on its first world tour, 'EPISODE 1: ZERO FRONTIER,' and will release its Japan debut best album 'N=MIXX' on December 9, beginning full-scale activities in Japan.