To marry into a wealthy family, she agrees to her future mother-in-law's demand to work as a food delivery courier for three months, only to face deliberate obstruction on her final day. The life-saving medicine she must deliver is for the very daughter her future mother-in-law refuses to acknowledge. Despite her mother-in-law's interference and punishment, she insists on saving the girl. As the story unfolds, the truth behind the mother's harsh treatment comes to light, along with a rescue from many years ago. In the end, she chooses to pursue independence and respect, finding a peaceful and happy life of her own.