Thank you very much for your feedback.
Right now, it's hard for me to sing the songs myself, but I made all the songs in the range that I can sing.
That's why I use synthesizer V, but I don't know the range of a woman's voice very well.
And synthesizer V doesn't support Korean yet, so I had no choice but to translate it into English, so there will be many awkward parts that don't match the pronunciation or grammar.
But I think it will get better little by little hahaha!
Thank you again.