JYJ's Junsu was recently spotted at senior singer Gummy's solo concert where he was revealed to be the guest singer of the day. 

During the concert, Junsu said prior to his performance, "I am on stage with my fellow agency artist and senior singer whom I respect a lot. This is the first time appearing as a guest singer since 10 years ago as a part of TVXQ.  I am very happy and thankful to be on stage with such a great vocalist, Gummy."

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According to the reports, Junsu sang "Love Like Snowflake," and "Loving You Keeps Me Alive," a popular number from the musical 'Dracula.' Gummy also thanked Junsu for being her guest singer and wrote on her personal Weibo, "Loyal Junsu, thank you so much and you're so good at singing." 

Meanwhile, Gummy held her solo concert, 'Fall In Memory,' at Samsung Hall, Ehwa University, on May 2nd.