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A story about youth and heartbeat is quietly unfolding. Gu Chenzhou and Xie Yuan, one a military drummer and the other a trumpet player, met while practicing together in the wind band, and the drumsticks and trumpets collided with each other, creating a subtle relationship. They left heart-beating footprints on the basketball court and the observatory. From training side by side on the track to the passionate sprint in the school sports meeting, every contact made their hearts beat faster. Cheng Xubai, Ji Zhaoran and other friends turned into "love strategists" and used data modeling and game thinking to assist, but they also accidentally caused a lot of ridiculous farces. As the relationship deepens, mysterious symbols, fluorescent codes, and puzzles intertwined between games and reality gradually emerge, and there seems to be a greater secret hidden behind them. Ji Zhaoran's live broadcast and other people's prying eyes and calculations put this relationship into crisis. In this youthful romantic adventure, can Gu Chenzhou and Xie Yu'an break through the obstacles, understand each other's heartbeats, and let the heartbeats on the sycamore leaves compose an eternal love song?