Dr. Jaehee Cheon, who lost her parents at such an early age that she can't even remember their faces and who has lived without a single friend, let alone a lover, reincarnated in a novel as the unlucky princess who will die at the age of twelve. If she can't find her biological father, she will die. But apparently, there are four candidates? And the even bigger problem is that all of them are too deadly... Will Chun Jae-hee be able to find her real father safely and have a happy ending?