Qiao Yin, a polar route real estate appraiser, was ordered to go to Freezing Port to appraise He's abandoned shipyard, but was arrogantly rejected by He Jianshuang, the illegitimate son of the He family. She deliberately lowered the shipyard's valuation in her report, but he saw through it on the spot - twenty years ago, He sank her father's scientific research vessel here; and He Jishuang's cold mechanical prosthetic leg was a relic of that accident. Two people stuck on the ice sheet by old hatreds tested each other and tore each other apart in the leaden sea fog, and finally discovered that there was a truth behind the "accident" that could overturn the entire shipping order in the Northern Ocean.
