On a stormy night, a grand wedding was being held at a luxury star hotel when a horrific tragedy broke out. The bridesmaid Ziqing (Angelica Lee) became the only eyewitness. At the police station, Ziqing insisted that the suspect was the mysterious person Sun Ling (Karena Lam) on CCTV. After learning that Sun Ling had an unusual secret relationship with her boyfriend, Ziqing, who had always felt that she owed her boyfriend because of kidney problems, almost collapsed. Ziqing was attacked by the murderer, but was saved by Sun Ling's timely rescue. When getting along with Sun Ling, Ziqing gradually forgave and appreciated her. Just as their friendship matured, the real murderer who had been at large began to approach them.