Omega Bite summary:

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."