가수 겸 보컬 트레이너 박선주가 이병헌-정우성-원빈의 ‘보컬 쓰앵님’이었다고 밝히며 이들 중 애제자를 뽑아 궁금증을 불러모은다.
Singer-vocal trainer Park Sun-joo says that she was the "vocal teacher" of Lee Byung-hun, Jung Woo-sung and Won-bin, revealing the most loved student among them, gathering attention.