Two years ago, the accidental murder of her mother (played by Li Juan) made Li Jiahe's (played by Deng Enxi) life completely "dark". Faced with the bullying of classmates and the cowardly father (played by Wu Guohua), the young girl Jiahe gradually developed a tough character of revenge. In a car accident, she ran into Yu Lei (played by Li Gan), a "juvenile offender" who returned early due to good performance in the work-study school. After seeking a lawyer to no avail, Jiahe was determined to complete her "minor revenge plan" before her 14th birthday. She followed and waited for an opportunity to get close to Yu Lei, learned to drink, hang out in Internet cafes, and even mixed with the social youth around him. Finally, when the opportunity came, she fell into the edge of danger and crime step by step...