Members of Shinhwa were once youth. They shared laughter together, they fought and they even cried. These happened more than a decade ago, so who would really remember them? Plus, they are all busy with their new busy lives.

However, they were reminded that they were once youth when they met again. But who bring them together? Why did they meet at a stange place? How did their memories being collected and turned into a book? Who did all of this?