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