L5ST

On August 1, L5ST posted that their debut was coming soon tweet with their logo. On August 17, it was announced that L5ST will debut with their first digital single (labeled as a single album), "Only One", on September 5. On August 23, Seogyum was revealed as a member.

On August 27, it was announced that Eun had left L5ST. On August 31, Donggyu was revealed as a member. On November 28, it was announced that L5ST would be releasing their second digital single, "Free Fall", on December 12.