B1A4's Sandeul previously announced through a long message on the group's official fan cafe that he will be releasing his first solo music sometime soon!
On September 26, WM Entertainment gave more information on it with, "Next month on the 4th, Sandeul is confirmed to release his first solo album. The title song was composed by singer-songwriter, Park Won. Rose Motel's Yook Joong Wan also gave Sandeul a composition as a present and MAMAMOO's Whee In finished a duet song with Sandeul."
Wow, sounds so exciting! This will be his first solo release since his debut six years ago.