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In the early years, Uncle Li adopted an offensive strategy in the war, which led to the unexpected death of his comrade Chen Sheng. Uncle Li and Wang Yi, who were comrades and friends, broke up and stopped contacting each other. More than 20 years later, due to a mountaineering activity, they reunited with the wishes of their friend Chen Sheng, and two young troubled youths formed a mountaineering team with them. After getting along for a few days, the two young people bravely faced the difficulties encountered during the mountaineering, which made Wang Yi and Uncle Li see They saw the figure of their comrade Chen Sheng. When they were about to reach the top of the mountain, in an extremely hypoxic environment, they resolutely handed the oxygen tank to the two young men. The four of them braved the cold wind and walked shoulder to shoulder step by step to the top of the mountain. Just when they were about to reach the top of the mountain, Wang Yi was trapped in a crack in the mountain. In order to protect him, and with the regret of not successfully rescuing Chen Sheng, Uncle Li rescued Wang Yi, but he fell into the unfathomable crack on the mountain...