magnum's manga / #Separated(3)

Alpha who left his alpha supremacist family suddenly has an omega child dropped off at his doorstep by the family butler. As an alpha, he was separated from his Omega father, his household only inviting back his Alpha dad and himself. As an adult, he vows never to become an Alpha like that. Through various struggles, he finds himself involved with an Omega coworker who was previously believed to be an Alpha, who also happens to be the mother to a child the same age as the kid in his care.