In a key high school in a rapidly developing city, five boys and girls with very different personalities are in the same class. They formed a friendship due to a bizarre sports misunderstanding, and faced together the pressure of entering higher education, family changes, the throbbing of first love, the collision of ideals and the challenges of reality. They use humor and witty self-mockery to dispel confusion, and protect each other more firmly after setbacks and grow together. In the end, after the college entrance examination, they went their separate ways, but with a youthful vow, each other's dreams and encouragement became each other's eternal backing.