Hyojung has lost her father at a young age. She worked multiple jobs for her family. But in the same time, she used the money on her dreams as well, she used some of it to enter a vocal academy to train her vocals. Her hard work really paid off, she's a great leader and I'm pretty sure that's what lead her to the strong power vocal she is today. I bet her father is proud at her little angel.
OMG why do I only know of this now, I love her so much