A World of Our Own When Ara is invited to have a threesome by the alluring Yoojin, she doesn’t expect her old high school friend Seungmin to show up as their third member. They’ve shared many things with each other back in the day, including discussions about sex, but they’ve never shared their bodies before. Tonight, though, everything is going to change. The question is: will it just be their bodies they share, or will there be something more?