So Serve Vocal is like in between Lead Vocal and Sub-Vocal? Because that's Sorn's position in the group (she hits the ballad's high note) and I still don't get it. I'm used to Main Vocal (which is, in the group, Seunghee) and to Lead Vocal (which is Seungyeon), bu it's the first time I see or hear of Sorn's vocal position.