On September 25, San E posted a photo via his Instagram page with the caption, "#theunit kbs first get together with mentors."
#hwangchiyeol hyungnim 'Generous'
#johyunah 'Always will be a 19 year old to me'
#rain hyungnim 'Le...legend
#sane 'hmmm...what am I? what do you all think?'
Rain will be acting as an MC/mentor, including Hwang Chi Yeol as a vocal mentor who previously worked with junior idols. Jo Hyun Ah will also be instructing participants. Last but not least, San E will be greeting contestants as a rapper.
Meanwhile, 'The Unit' will feature various idol groups such as DIA, Boys Republic, LABOUM, Boyfriend, Dal Shabet, Hot Shot, BLACK6IX, Wassup, and much more.