Real high school students take the college entrance examination and their mothers accompany them for incestuous relief.

The film follows a real-life high school senior who, under the immense pressure of China's Gaokao, develops a taboo incestuous relationship with his accompanying mother as an extreme outlet for stress. The story centers on the tense atmosphere in the days leading up to the exam, exploring the emotional entanglements and physical collisions between mother and son, while highlighting conflicts between adolescent impulses, familial taboos, and societal pressures. The accompanying mother evolves from initial care to indulgence and active participation, with their relationship spiraling out of control both inside and outside the exam hall, culminating in an emotional climax and reflection after the Gaokao concludes.