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This is a story about luck and misfortune. Li Shiwei is a girl who is entangled with fate. Her extraordinary talent is the misfortune hidden in her luck. Because of a set of mathematical number theory, she meets Chen Zhihe, a young man who is equally lucky and unfortunate. The two go through eight years of research on number theory. They experience number theory being stolen, being captured by a drug lord, being ridden by bad luck, losing relatives, and being disillusioned. They smile peacefully under the orange street lights...