Oh Bom and Kang Maru lost their parents in accidents on the same day. However, a greater suffering is yet to come for both of them. Oh Boms past was just the beginning of the tragedy. Taking on her fathers debt, more than 40 thousand dollars, she finds his secret diary about her birth. The diary says she was a missing child and his parents tried to find her real family. She lost her parents twice overnight. Then, her new life full of ups and downs begins with a huge debt.