2017 single by Jonghyun featuring Taeyeon
"Lonely" is a song by South Korean singer-songwriter Jonghyun featuring Taeyeon, a member of girl group Girls' Generation. It was released on April 24, 2017 through SM Entertainment, and served as the lead single for his second compilation album, Story Op.2. It was written, composed and arranged by Jonghyun in collaboration with Wefreaky, Monotree and Imlay. "Lonely" was the last single released by Jonghyun during his lifetime and experienced a surge in popularity following his death by suicide on December 18, 2017, reaching number one on Gaon Digital Chart. It has come to be viewed as emblematic of his struggles with mental health.