Tide Flat Shore

"Jiang Yu, if one day the tide washes us away, what will you do?" Seventeen-year-old Su Wanxing sat on the edge of the rooftop and asked, shaking his legs. "I can build a bridge." Eighteen-year-old Jiang Yu drew a force analysis diagram in his exercise book without raising his head. "What if the bridge collapses?" "Then learn to swim." "What if the water is too cold?" Jiang Yu finally looked up, and the setting sun dyed his eyelashes golden: "Then I will wait for you to learn winter swimming." None of them expected that the sea water would be so cold ten years later. So cold that all promises freeze and all bridges break.