you walk through a fire cave then you hear someone singing a song called King but it was the FNF version of the song

If you are Janna (me), you might know this person who is singing once you approach him

You keep hearing the singing and you keep on following the singing until it leads you to a part of the cave and you see a throne and someone sitting in it holding a crown that kings wear

The person does not seem happy because of his brother but it's a long story

He wants him back