The unrestrained swordsman Huo Zhanbai seeks medicine for a friend's child and encounters the pharmacist Xue Ziye. Over eight years of daily interaction, they progress from having their own convictions to deepening understanding, mutual redemption, and a promise to meet under a plum tree the following year. However, due to the responsibilities they bear, they find it difficult to express their love, leaving behind a regret of eternal separation. Amidst the joyous toasts in the snowy night and a farewell across a thousand miles, a poignant and unforgettable missed opportunity unfolds—a love destined to be unable to endure, depicting a tale of redemption and letting go in a life-and-death romance.

该剧改编自温瑞安的小说《神州奇侠》，讲述了一名酷爱武侠小说却被现实磨平棱角的咸鱼肖明明（成毅 饰），以小说男主角萧秋水的视角游历了一次武林世界，从武力低微、热血冲动的少年剑客，最终成长为有情有义、守护家国的大侠。此后肖明明在工作之余也不忘创作，在小说中继续传递人心因义而聚的信念的故事。