Ling Yixin was once a top mercenary. Due to war, he suffered from post-traumatic stress disorder, and views his daughter Ling Yaya as a precious treasure. After being discharged from the hospital, he picked up Yaya from school, but encountered Hu Qiaohui falsely accusing Yaya of stealing money, beating and scolding her, smashing her medicine, and even forcing Ling Yixin to kneel. Gu Ruoxi rushed over and saved Yaya, and Ma Chen and his wife committed violence against Gu Ruoxi again, causing Ling Yixin to fight back. The school surveillance was broken and the teacher gave false testimony, and the inspector could not arrest him due to Ling Yixin's psychiatric certificate. Ma Chen and his wife were unwilling to let it go, and hired thugs to commit violence in the street, but were instead subdued by Gu Ruoxi, who informed them of Ling Yixin's identity. In the end, Ma Chen and his wife were completely blacklisted, and Ling Yixin took his family away.