Hyun Jun and Sun Woo go to an amusement park to look into a child abduction case. They meet a woman who claims that this case is not a simple child abduction case, but rather it is a serial kidnapping case. She claims that her child, who was kidnapped eight years ago, was taken the same way that the most recent child was. The NCI team goes on to look into this case to find the culprit behind the kidnappings.