Twenty years ago, a twist of fate caused two girls to grow up in each other's places. Twenty years later, a crescent-shaped birthmark brings the past to light. With the help of family, friends, and compassionate supporters from a children's welfare home, everyone uses kindness, communication, and scientific testing to uncover the truth. Gu Nian'an returns to her father's side, while Gu Wanning finds understanding and blessings. The two families make up for lost time with love, cherish the present, and join hands to embrace a warm and brighter new life.