Who in their right mind would engage in such a thing between friends?" Cha Jae-Heon, a hot-blooded alpha who hides his feelings by trying to consider a childhood friend just a friend with the principle of "There shouldn't be any emotions involved!" One day, while he was satisfied with his friendship with Ki Je-Yeon, a dominant omega and a guide, who is allergic to pheromones, a sudden turn of events leads to an unexpected rut guidance sex! Will Jae-Heon overcome the barriers of pheromone allergy reactions and find true love?