FNC娛樂
On October 12, FNC Entertainment released mysterious teaser "Lonely 2015.10.22". A day later, FNC Entertainment confirmed that N.Flying would be releasing their first single album, "Lonely," on October 22. On October 15, N.Flying released individual member teasers. From October 18 to October 20, N.Flying released teaser music video. On October 20, N.Flying confirmed their first single album track list and released highlight medley. N.Flying's first single album "Lonely" was released on October 22.