As an ordinary but hard-working undergraduate, Won-Hyeok diligently prepared for his overseas studies, without ever reaching out to his stepmother for help. Suddenly, appearing in front of Won-Hyeok is his stepbrother, Han-Seo. Within the walls of Won-Hyeok's empty home, as if he’s ready to leave at any moment, the mysterious chemistry between the two overflows. "My rut is here. This time too, get through it with me." For a Beta like Won-Hyeok, the way an Alpha like Han-Seo treats him makes him slightly anxious... How will Won-Hyeok continue to face Han-Seo, a person he finds hard to understand, both in the past and the present?

(Source: Ridibooks, translated)

Note: Chapter count includes a prologue.