Cheng Yan, who was divorced at the age of 35, was hit by a car and returned to 2005 when he thought about his first love, Luo Qin. When I opened my eyes, I was in a fifth-grade elementary school classroom. The girl at the same table was using scotch tape to patch up worn-out homework books. Her little hands with frostbite concealed the tragedy of her past life when she dropped out of school, went to a factory, and lost contact for life. Bind to the [age-adapted sign-in system], from daily pocket money of five yuan, secret frostbite cream, to future stock information and black technology blueprints, Cheng Yan used his constant companionship to protect the low self-esteem and stubborn left-behind child between the aluminum lunch box and the boiler room. This time, he no longer made the wrong choice. He wanted to heal her and his own desolate half life.