Do-yoon, who had cherished Soo-ah as if he were his younger brother since childhood, finds himself entangled in an intimacy with Soo-ah during his heat cycle. Despite being a beta, Do-yoon wants to help Soo-ah, who is suffering from the heat, but being dominated by an omega is a new experience... Is this really a heat cycle? "Since you like those trashy delinquents, I'll try harder."