Karen, a police hostage negotiator, knocked down his license on a deserted road and hitchhiked with Flan and Lean. On the way, Frank learned from the owner of the gas station that his wife was having an affair and was furious. He shot his wife and killed her. Karen narrowly escaped to the government secret inspection room to take refuge. Karen found that the experiment carried out there would allow her to go back to the past twenty minutes. In order to save Ryan's life, she tried to go back to the past, only to find that more and more people were involved.