Retired boxing champion Qin Xia rescues Lu Qianmian, the Lu family's young daughter, from a wild boar attack in the wilderness. Impressed by her skills, Lu Tingxuan, the head of the Lu family, hires her for a generous salary to become the stepmother and bodyguard of his two children. After marrying into the Lu family, Qin Xia discovers that the eldest son, Lu Xingyao, is a teenager with an extreme case of chuunibyou syndrome who dyes his hair in seven colors, while the younger daughter, Lu Qianmian, is hopelessly lovesick, constantly transferring money to her crush and writing love confessions in blood. Using her iron fists and genuine affection, Qin Xia manages to tame them both. Amid their chaotic daily lives, she showers the two with sincere love and care, turning them into her precious treasures. Meanwhile, the cold-faced CEO Lu Tingxuan gradually falls for her warmth and cheerful personality. In the end, Qin Xia wins the acceptance of the entire family and finds true love with Lu Tingxuan.