Ever since Rai could remember, she has been living a life of a genius Alpha that has a special sense of smelling. She could easily smell the scents of others and determine their genders, leading to her isolation. And that is the ultimate reason for her overflowing loves and protections towards her adopted little brother, Baekhyun, an Omega boy who smells like flowers to her. But can Rai let go of her precious little brother when the time comes? "Sis, I think I'm in love."