In December 23, he released a single entitled "Melody", a collaboration with the South Korean legendary rock band Eve as a pre-release single on Christmas Eve, a nod to the band's debut on Christmas Eve in 1997.
After appearing on the show, he earned more recognition and received MC roles from other shows — such as Phantom Singer, Singderella, Secretly Greatly, Game Show Yoo Hee Nak Rak and Lipstick Prince, earning him the title "Professional MC".
Their stage name is a mix of Heechul's nickname "Universe Star" and Buzz's song "Coward".
The song proved to be successful, topping the South Korean Gaon Digital Chart, an achievement known as "all-kill", making him the first Super Junior member to achieve "all-kill" in 2016.
They came up with the name during recording Knowing Bros.On the January 21 episode of Channel A’s “Singderella,” while talking about his attitude towards love, Kim Heechul inadvertently revealed that he had appeared in a broadcast with an ex-girlfriend before.The topic of breakups popped up from time to time throughout the episode, and the cast was understandably curious about Kim Heechul’s experiences.Prior to his debut in Super Junior, Heechul began his acting career in 2005, starring in the second season of teen drama Sharp 2.Subsequently, this led him to host his first music show Show!