On December 5, Hwang Chi Yeol aired 'V' to talk to his fans after a fan meeting event. During 'V,' the singer mentioned, "I released a song "Mello" with Solar from MAMAMOO...I'd like to thank her here."
He added, "I met Solar for the first time last year at an award show and saw her next at the 'Asia Artist Awards' this year; it would be only my third time meeting her at our recording, so at the recent award show, I tried to make things less awkward by saying hello to her first." Hwang Chi Yeol thanked Solar, saying, "She was really great when we worked together recording the song, so I am thankful."
Hwang Chi Yeol and Solar's collaboration project, "Mellow," was released on November 30.