윤종신
In October 2016, it was announced that popular singer Sung Si-kyung would participated to composing in Kyuhyun's upcoming album and schedule to release within that year. Kyuhyun performed the new track at his concert "Reminiscence of a novelist" on October 29 to 30 at Ehwa Womans University and Busan from November 5 to 6 at Bexco Auditorium. His third EP, "Waiting, Still", was released on November 10. The album has including double title track, "Blah Blah" was produced by popular singer-songwriter Yoon Jong-shin and "Still" was produced by popular ballad singer Sung Si-kyung.