631(MUMii) released their first album "Doo6" with 8 songs on November 20. Luvit, shigma, and :DSLowvv were invited as guest artists. The beat for "Doll" was produced by beatmaker ayame, who also works with :DSLowvv as part of klutz Doo6. Track 2. "miss U" was mixed and mastered by shigma, who also joined the feature. The other songs on the album were mixed and mastered by Fro$h, who is also a beat maker. The jacket was designed by 631 himself. The title of the album, "Doo6," is taken from the name of 631's thoughts and the name of his crew, Klutz Doo6, which is a reference to the dolls that are made from the same material, but look different, and to the people who live today.