A Chinese teacher in Busan awaits 3 of his friends to spend holidays together in Jeju Island, Korea. Secret gangsters, Sexy Korean woman, old policeman and pastors exist in their tour one by one. The tour became a mysterious and unknown adventures.

Woo Jin takes care of his son Ji Ho alone after his wife Soo A passed away. Before she passed away, she promised she would be back on a rainy day one year later. One year later, Soo A appears again, but she does not remember anything.