"A Moment of Tranquility" tells the story of Chen Yishi and Lu Ning's youthful sadomasochism, which was full of twists and turns. After Lu Ning graduated from high school, she entered the university majoring in computer science. During her first campaign on campus, she and Chen Yishi forged a relationship, which started with Chen Yishi's frustration. Later, Lu Ning met her good friend Chen Ya, and her life seemed to have a touch of warmth. However, Chen Yishi repeatedly "looked for trouble" and scared away the kitten she was teasing. After running for class president, he selflessly reported her for not doing her homework, so that Lu Ning was punished for running on the playground under the scorching sun. Lu Ning grew up in a broken family. Her childhood trauma made her sensitive and fragile. Her grievances after running and her crying late at night all concealed her unknown pain. After Chen Yishi saw her fragility, he quietly blamed himself and tried to make up for it. During military training, Lu Ning, who was afraid of being killed in the army, was caught slacking off and faced an 8,000-word punishment. The relationship between the two was like a tight string in this series of events. Under the different opinions of others, it became more and more subtle this autumn. Can they break the deadlock and find a moment of inner peace?