According to the official track description, the de facto intro of the album:
‘+ +’ is a mash-up of the intro tracks of the albums by LOOΠΔ 1/3, ODD EYE CIRCLE, and yyxy.
Lyrics for this song have yet to be released
+ + was written by SlyBerry & BADD & Artronic Waves & GDLO & NOPARI & 황현 (Hwang Hyun) (MonoTree).