Naive and awkward Gu-chang is on his seventh year of college, constantly failing job interviews and living off of an allowance from his divorced sister. The almost 30-year-old virgin has never had a girlfriend, or even kissed a girl before. One day, he picks up a wallet at a dining hall and meets its owner: sweet, innocent and bashful Ani. He falls in love with her instantly and the two begin dating. But just when everything seems to be going well, he discovers another side to Ani: she becomes overly aggressive, drinks too much and cusses loudly. He learns that his girlfriend has multiple personality disorder, and that wild and violent Hani is one of her two personalities.
After failing to kill himself by jumping off a bridge, the man is washed up on a deserted island in the middle of the river, but within view of the city’s high-rises. He attempts to escape, but soon accepts his fate and the challenges in living on the island. A reclusive young woman, who takes close-up shots of the moon and has not left her apartment in years, spies him on the island and comes to think of him as her own alien.