Tong Xiaodie had a beautiful relationship. Of course, it was in the eyes of others, but for Tong Xiaodie, it was over before it even started. Seventy years later, Tong Xiaodie passed away, but it was her granddaughter who recalled the story bit by bit. There are mermaids in the East China Sea who can live for thousands of years, but the fish forget about the mermaids in seven seconds, and they can be forgotten for seventy years...