Lee Soo-ha, who has been locked up in an unidentified institution for a long time, is dragged by strangers and meets a man one day. Lee Soo-ha then lives with this man, whom he discovers to be an Omega who was sold to him, an Alpha. He is worried about his situation: he does not have a heat cycle and is unable to conceive because of his abnormal physical condition, but this man does not care, even if Lee Soo-ha does not do his omega work. It's just confusing to learn what a man's inside is, hatred towards him and feelings of déjà-vu, and it's just confusing as unknown things continue to happen...