Lee Gang Doo and Ha Moon Soo are the survivors of a major shopping mall collapse. Ten years after that tragic day, the incident still profoundly affects their lives and seems to have bound them—by the most classic of red threads—to a shared fate that is about to bring them together, under unlikely circumstances, of course. The two seem destined to meet, perhaps so that each can help the other heal their wounds and traumas, and thus try to start living again.