Seo Hajun, the popular Alpha who's always the subject of gossip in the department. The day after getting drunk, he wakes up in shock with sudden butt pain and the scent of an Omega. The other party? None other than the notorious Omega, Oh Yoonwoo! Refusing to accept what happened, especially to Yoonwoo, Hajun decides to confront him... 'Don’t tell me you forgot what happened yesterday? After you even imprinted on me like this.'