Butas 2

　　Five members of the mountain bike club, Sangaja. To ride a mountain bike, we head to Chiaksan Mountain, where Min-joon's Uncle villa is located. After arriving at Chiaksan Mountain and enjoying the ride, strange things began to happen to the party…. And something unidentified chasing them! A desperate survival game for Sangaja's party to survive on Chiaksan Mountain begins.

　　2056 - Company soldier Hannah and scientists Gavin and Dimitri are on board of RUBIKON space station researching an algae project aimed to provide humanity with a permanent supply of oxygen and food. But all of a sudden the earth beneath them disappears in a brown, toxic fog and all contacts are broken - are they the last survivors? Should they leave the safe station, risk their lives by flying back? What is worth living for, what is worth dying for?

 故事发生在小嗝嗝与没牙仔分开的五年之后，博克岛一年一度的亲衣节又到了，然而随着小嗝嗝的孩子们的长大，对龙与人曾经那段真挚而深刻的友谊只能通过父母的言语来了解，不免产生了质疑，小嗝嗝为防止孩子们对龙的误解，又能想出怎样的妙招呢？