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Lin Dong, Zhao Ping, Zhou Yi, and Zheng Xiaoxiao, four friends who lived ordinary lives, were inadvertently involved in a huge conspiracy, and thus began a strange and magnificent journey. During the journey, they experienced their own stories and the stories of others, and met many people who influenced their destiny. Although the cruel war, the inevitable fate, the choice of life and death, and the alienation from reality cannot cut off the four people's faint friendship, their hearts are also quietly changing during this journey.