OnlyOneOf's Rie will be making a solo debut soon.

On October 10 at midnight KST, OnlyOneOf revealed member Rie's music video teaser for 'undergrOund idOl #4'. He also gave a sneak preview of the lyrics which reads, "Perhaps everything is already decided like destiny. Like the universe, it can’t be explained."

Meanwhile, Rie will be debuting as a solo artist following member Junji in August with the title song "because," making him the 4th member to debut as a solo artist in the group. 

Rie will continue to tease the release of his first solo single, so stay tuned for updates.