In the not-so distant future, researchers at a deep-sea laboratory have finally succeeded in inventing a time machine. Heavily burdened by financial stress, head researcher Woo-seok is promised more funding from a mega-corporation, if he successfully completes a test flight. Ji-wan tries to stop his colleague and lover, Young-eun from going on the dangerous flight, but Woo-seok and Young-eun carry out the mission and travel to 11 A.M.Â—the next day.
They arrive at the planned time only to find the base on the verge of collapse. All the researchers are gone and someone is out to kill them. Woo-seok begins the tedious process of piecing together what happened in the 24 hours between when Young-eun and he left home in the present and the futureÂ—now. They make one solid discovery: the researchers killed each other before they disappeared.