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Former bomb disposal expert, Song Kang-Ren, and his fiancée, Huang Xin, board a high-speed train that contains a bomb. At the same time, Liu Kai, a well-known physics teacher who was involved in an affair scandal, also boards this same train in order to win back his wife, Ting Juan, who took the prior high-speed rail to return home in frustration… After all, can the bomb be successfully defused this time? and resolve the crisis?