Soyu (Sistar)&Brother Su (브라더수)✿You Don`t Know Me (모르나봐) [She Was Pretty (그녀는 예뻤다) OST Part 4]✿Soyu (Sistar)&Brother Su (브라더수)✿You Don`t Know Me (모르나봐) [She Was Pretty (그녀는 예뻤다) OST Part 4]