share time: 2026-02-07 12:30:25
Lin Chuan, a math modeling genius, travels to the northern birch forest to solve an ecological algorithm, only to clash with Xu Wan, a forester's daughter, over the conflict of "conservation vs. development". When Lin finds his father's old research notes hidden in a birch hollow, and Xu uses his formula to convince the developers, they realize—the "heartbeat equation" isn't just numbers—it's every birch leaf they counted together, every starry night they guarded, and the courage to break their principles for each other.
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02:21:40
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