Can A Xin sing with the four vocal organs of the human body? And did he study music before he became the lead singer of Mayday?

A Xin obviously only uses vocal cords to sing, so when singing at a concert, the treble is obviously impossible to sing, because it is impossible to sing a real treble just by mentioning the Adam's apple. ...

In addition, A Xin only majored in art and interior design at school, so he didn't study music before graduation.

Hope to adopt, thank you.