If you want to take this role, your voice should be high and good. I'm not saying that you need to be sound/sing like Jimin. Sing energetically. Must have a pretty good pronunciation. Try send me a short acapella cover of Jimin's Lie, the chorus part only and the last part where he sings in his highest pitch. (Don't force yourself to sing that high, okay?) Just sing comfortably and beautifully. Good luck!