Pheromone Baby summary:

Beta Jihan, who had a relationship with Yoonseo, who was his next-door neighbor since he was young. Jihan then learns of a sudden pregnancy and that he had developed omega traits. Although it was clear that the father of the child was Yoonseo, a dominant alpha, Jihan decided to erase the child for the future of Yoonseo, who is still a college student. However, Yoonseo readily informs Jihan that both the pregnancy and trait change are all his ploys...