Lu Li, a college student, unexpectedly received a letter from his friend Lin Yan, who had been missing for five years. In the letter, his friend asked Lu Li for help. Lu Li soon found the express delivery address. In an abandoned factory, Lu Li met the mysterious young man Xiao Yuanxi. The two came together with different purposes. After that, Lu Li was in danger many times, but Xiao Yuanxi repeatedly rescued him. Who is he? What is the purpose of approaching Lu Li? Is Lin Yan still alive after missing for five years? Will all these mysteries be solved?
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