Jehyun, a beta researcher studying Alpha-Omega gene replication, is given a secret mission: lie low for a while and act as guardian for AP1, a dominant Alpha test subject. Moved by the experiment’s innocent eyes, he grows attached to the young subject and names him “Ian.” But the very next day, Jae-hyun wakes up to find a towering man waiting for him…a man who turns out to be none other than Ian himself, now suddenly fully grown and overwhelming in stature. In this twisted tale of genetic experiments and forbidden bonds, who’s really taming whom?