Shi Hong is a middle school math teacher who enjoys the company of his neighbors, a divorcee (Chen Jing) and her young daughter.  One night, Chen Jing becomes a victim to a domestic abuse incident involving her ex-husband, Fu Jian that spirals out of control leading to Fu Jian's death.

Shi Hong becomes involved in helping Chen Jing and her daughter cover up the crime.  When Shi Hong's old classmate Tang Chuan becomes involved in helping the police investigate the crime, Shi Hong must betray his friend's trust and involve himself in a dangerous cat-and-mouse game that reveals the depths of his feelings for Chen Jing and her daughter.