[3][4] On May 15, 2018, WM Entertainment announced that ONF will make their comeback on June 7, 2018 with the group's 2nd mini album "You Complete Me".

[4] On May 31, 2018, WM Entertainment released the lyrics teaser image of their lead single,"Complete".

[6] On June 1, 2018, WM Entertainment released the unofficial member's individual teaser image together with their highlight medley for the album.

[8] On June 7, 2018, ONF performed their new second album, "You Complete Me" on the showcase event that was held at Hoe Hung-dong New World, Central District, Seoul.

[9][10] The group made their comeback, performing their lead single,"Complete" and "Fly Me to The Moon" on June 7 on Mnet's M Countdown.