Your idol

Hello, I'm back after how ever long I've been gone, and I'm making a K-pop demon hunters talkie. So, to the story- You are part of the saja boys. secretly, only Jinu knows about you, and you write their songs for them, but again, only Jinu knows, the other boys think Jinu is writing the songs, but now, they are performing Your Idol, and this time, you join in the song. I would put the lyrics and who sings each song, but it doesn't fit