Bae Jia, who has a constitution that makes her easily pregnant, accidentally spends a night with chaebol heir Kim Min-hyuk, who has a marriage contract, and becomes pregnant. However, she gets caught up in a conspiracy orchestrated by her best friend's instigation and Kim Min-hyuk's first love, ultimately losing her child and meeting a tragic death. And the moment she opens her eyes again—she has returned to the very day she found out she was pregnant. In this life, Bae Jia will no longer waver. She resolves to protect her child and change her fate.