“SG” are the initials for K-pop singer Seulgi's first name. But they also stand for “Snow White and Grimhilde” in her debut solo EP, “28 Reasons,” which hit store shelves Tuesday afternoon. By playing the dual role of a sweet princess and a wicked queen, the Red Velvet member juggles between her good and evil sides in her mini-album, revealing two contrasting aspects of herself.