For Ki-Yoong Park, someone who's reached the peak of his sex drive, having an orgasm was the best joy of his life. After serving his compulsory military service, for two years, he is now about to be discharged from his duty and into the civilian world. As the saying goes, patience will persevere: Ki-Yoong Park desperately aims to enjoy the free night with the girl he loves, whom awaits outside, but, what's this dream? Whenever he has an orgasm, time rewinds. Will he ever be able to shift himself away from the time rift?