That summer, the anonymous musician "JIA" received a melody late at night that perfectly complemented the chorus she was stuck on. The sender is called "Light Source".
During the day, she is He Jia, a quiet and introverted top student, and Zhang Zhenyuan, the lead singer of the campus band. They met through a campus music competition, and he invited her to write lyrics for the band.
He Jia didn't know that Zhang Zhenyuan was the "light source". Zhang Zhenyuan also didn't know that JIA, whom he admired, was sitting in front of him at the moment, revising the lyrics for him.
And their respective friends - the rational Le Xiaotong and the casual genius Song Yaxuan, the cool dancer Liu Qi and the gentle choreographer Ding Chengxin, the social master Wei Shiqi and the delicate drummer He Junlin - are also intertwined because of music this summer. Everyone has their own secrets, and every relationship is like an unfinished piece of music.
When the rainy season comes, the echo will eventually find its original voice. The youth symphony of eight boys and girls about music, growth and heartbeat quietly played in the same summer.
