In the not-so distant future, researchers at a deep-sea laboratory have finally invented a time machine. Head researcher Woo-seok is promised funding from a mega-corporation if he completes a test flight. He and Young-eun carry out the mission and travel to 11 A.M. the next day, only to find the base on the verge of collapse. All the researchers are gone and someone is out to kill them.
When young Jae-woo reaches the upper ranks of South Korea's national kendo team selection, he is shocked to learn his main competition is the man who accidentally killed his older brother.
Ji-eun dreams of becoming a police officer, but lives as a punk. Jin-gu is a typical nerd but is obsessed with sports Toto. They meet by chance, fall in love, and have an exciting first date at Ji-eun's house, but due to a serial killer hiding in the house, The story of a day that love turns into a messy fights.
