Soo Seong-hyun, a popular hair designer, is in unrequited love for her best friend, Jeong Jun-yeon. At Jun-yeon’s request, Seong-hyeon teaches his younger sister, Jae-yeon, and Seong-hyeon keeps feeling faint pheromones from Jae-yeon, whom he knew as a beta. Then one day, clothes covered in pheromones are discovered among the gifts received from Jaeyeon. Seong-hyeon reacts to the pheromone and becomes in heat differently than usual, and masturbates while listening to Jun-yeon’s voice who was talking on the phone… ‘Some crazy omega sprayed pheromones like this… !’