In a world where innate traits determine everything. Inwoo, an Alpha from a poor family, uses a pheromone booster in order to join the Dominant Alpha Student Council, which guarantees success. But as a side effect, he temporarily becomes an Omega. Then, Inwoo’s classmate, Haeyoung, shows up. Haeyoung, a dominant Omega and heir to a large hospital, makes a sudden proposal to Inwoo in exchange for a cure to his trait mutation. "Will you sleep with me? If I like what you do, I’ll give you the medicine."