Former forensic official Yiren welcomes his daughter Jiang Xiaomeng out of the nursing home. The father and daughter start a new life together with Xu Haiyin, a journalist who turned into a foundation public relations officer. However, they are involved in a series of deaths, and Fang Yiren becomes the number one suspect.The case leads to a murder case he handled 15 years ago. The reputation of his mentor Lin Jingrui is also questioned. He must cooperate with detective Zhao Chengkuan and forensic doctor Xue Xinning to find out the truth and clear his name, otherwise he will lose his home with Xiaomeng again.