Ten years of life and death are so vast that I cannot forget them without thinking about them. After missing ten years, once I look back, the beauty is no longer there. Who still remembers the promise made to the blue and purple iris? Who still insists on missing out on revisiting together ten years later? Who still expects that the past of making mistakes again and again will be regrettable? Can he and her escape the fate of "iris" and perform perfect love...