Deuk-cheon, a detective from the homicide division, would do anything to get her only daughter the treatment she needs to increase her chance of surviving her leukemia. But just when she is finally hospitalized to get the stem cells injection she critically needs, she gets kidnapped. It doesn’t take long for Deuk-cheon to catch the suspect, Seong-jun, but the latter persistently claims that he has lost his memory and has nothing to do with that. As strange as it may seem, Deuk-cheon soon finds out that there is indeed another man looking just like Seong-jun and sharing the exact same DNA. Both men are human clones, and Seong-jun intends to prove his innocence.