The Guardian of the DaughterEpisode 4

Ling Yixin used to be a top-notch mercenary. Due to the war, he suffered from post-traumatic stress disorder and regarded his daughter Ling Yaya as a precious treasure. After being discharged from the hospital, he went to pick Yaya up from school, but encountered Hu Qiaohui who falsely accused Yaya of stealing money. Hu Qiaohui beat and scolded Yaya, smashed the medicine, and even forced Ling Yixin to kneel down. Gu Ruoxi arrived in time and saved Yaya. However, the Ma Chen couple then committed violence against Gu Ruoxi, and Ling Yixin fought back. The school's surveillance system was broken, and the teachers gave false testimony. The inspector couldn't arrest him because of Ling Yixin's certificate of mental illness. The Ma Chen couple, unwilling to give up, hired hooligans to commit violence on the street. Instead, Gu Ruoxi, who had been informed of Ling Yixin's identity by Ling Yixin, subdued them. In the end, the Ma Chen couple were completely blocked, and Ling Yixin took his family and left.