Mark, embarking on a solo career, makes a comeback with a new song on September 10.

I heard that Mark is making his first comeback since going solo with the release of his new song 'My Friend' on September 10th. I heard that he personally participated in writing the lyrics, composing the music, and arranging the song. As this marks a fresh start as a solo artist, I am genuinely looking forward to seeing what kind of music he will present.