Down on his luck and at his lowest point, Ye Cheng meets Bai Yu on a rainy night, a girl who lives alone and knows little of the world. She spends all her savings to help him settle into her shabby old rental. As he looks after Bai Yu, who lacks even the most basic life skills, and teaches her how to manage everyday life, he gradually learns the secret truth about how her mother kept her imprisoned for years. Meanwhile, the door lock, repeatedly damaged by malicious hands, casts a shadow of danger over their lives. Two ordinary people at their lowest ebb become each other’s salvation through the small, everyday moments they share.
