윤종신
In 2011, Kyuhyun contributed to group mate Siwon's drama "Poseidon" with the track "The Way to Break Up." The single was composed by Yoon Jong-shin and was also included in Yoon's monthly project album. Kyuhyun sang "Late Autumn" for Yoon's November monthly project later that year. He also appeared on KBS's music competition program , replacing group mate Yesung on the show. Kyuhyun went on to win two rounds.