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On a stormy night, a grand wedding is being held in a luxury star-rated hotel. A shocking tragedy suddenly happens, and the bridesmaid Qing Zi (Li Xinjie) becomes the only witness. At the police station, Qing Zi insists that the suspect is the mysterious Sun Ling (Lin Jiaxin) of CCTV. After learning that Sun Ling had an unusual affair with her boyfriend, she felt that she was in debt to her boyfriend because of kidney problems, and almost collapsed.

Ziqing was attacked by the murderer, but thanks to Sun Ling's timely help, he recovered his life. When getting along with Sun Ling, Qing Zi gradually became tolerant and grateful. Just as their friendship was maturing, the real murderer who had been at large began to approach them.