Lin Qingyan is recognized as a top student and a transparent artist, but at the opening ceremony of the first year of high school, he fell in love with the dazzling Jiangyu River at first sight. But she didn't know that the school idol, who was sought after by all the girls in the school, had already quietly locked his eyes on countless moments when she lowered her head to answer questions and recited on the stage. From their careful exploration, to the accidental side-by-side during recess exercises, to the tacit understanding of occupying seats in the library, and the two-way guarding at the sports meeting, their youth is filled with the sweetness of "I like you, and you also like me." But when the graduation bell rang, the real choice caused them to be separated temporarily. When they reunited many years later, they discovered that the heartbeat of those young years had never been extinguished. This time, they would hold each other's hands and move from campus to a longer time...