The hustle and bustle of the graduation ceremony had not completely dissipated from his ears. Lin Hui clutched the strap of his backpack so tightly that his nails dug into his palms, leaving a few shallow crescent marks. But the voice was surprisingly calm and powerful, and there was no trace of waves: "Yang Guang, let's forget it. Really." It was crisp and clear, like her packed luggage... Seven years later, the dust-laden mystery is about to unfold, the mystery of breakup, the mystery of life, the mystery of marriage, the mystery of death...