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A-lo (played by Zhou Yingjie), Si-min (played by Zhou Liqi), and A-li (played by Zhou Zijiu) are three young people with rare blood types. They do not know each other, but they have a strange connection, which leaves them feeling uneasy and wondering what has happened. It turns out that the common thread among the three is that they all donated blood, and their blood was used to save a couple who attempted suicide together. As a result, the man was miraculously brought back from the brink of death, while the woman tragically crossed over to the afterlife. The woman's name is Yanping (played by Liang Minding). Alone in the underworld, Yanping feels immense pain and unjustly blames the blood donated by A-lo, Si-min, and A-li for her fate. Yanping seizes the opportunity to approach the three, determined to seek revenge for their "life-saving act." Can the three escape the wrath of the vengeful ghost?