"Who in their right mind would engage in something like that with a friend?" Cha Jae-Heon, a passionate alpha who masks his feelings by adhering to the principle of keeping his childhood friend, Ki Je-Yeon, as 'just a friend,' finds his world turned upside down. Je-Yeon, a dominant omega and a guide who is allergic to pheromones, suddenly agrees to help Jae-heon during a rut. As they navigate this unexpected turn of events, will Jae-Heon be able to overcome the challenges posed by pheromone allergies and discover what true love really means?