On March 26, 1991, five boys set off to the mountain to go frog hunting and never come back to their family. While a documentary producer, detective and professor try to solve the mystery of the incident, one of the boys' parents is a suspect.
A thriller about the passengers with different objectives on board a cruiser headed for China, being chased over and over again and unexpected happening of things.
When Young-min and Mi-young marry each other after they graduate college, they experience different challenges that test their relationship.
