On a rainy night in an industrial town at the end of 2007, the retired criminal police officer Liu Weidong who was living alone got involved in a criminal case that happened to his neighbours inadvertently. That night, A man named Lin Guodong got drunk, and once again, imposed domestic violence on his wife Li Xiujuan, whose son Lin Mu was trying to protect her, but while defending, accidentally killed his foster father Lin Guodong. In order to protect her son who could have a bright future, Li Xiujuan wanted to bear the charges of manslaughter, and surrendered herself to the police. But Liu Weidong, the old criminal police in his 60s who got involved by accident chose to protect the mother and son who had already suffered a lot. And after struggling, the son Lin Mu, a kind but helpless teenager, also chose to face and bear whatever was in front.