Bong-Pil (Kim Jae-Joong) has been preparing for his civil servant exam for the past 3 years, but he is not enthusiastic about his studies. He becomes disappointed that his lifelong friend Soo-Jin (Uee) will soon get married. He has loved her in vain for the past 28 years. Bong-Pil then falls into a manhole and travels through time. He struggles to prevent Soo-Jin's imminent wedding.