Su Shisheng worked as a marine fish breeder for three years, and she looked like a salted fish after being exposed to the sun at the beach. She thought she would never see Lu Yan again in her life - her first high school love who disappeared without even saying goodbye at the graduation ceremony. Until one day, a research team from the city stood on the raft of her house. The leader, a man in a suit and leather shoes, held a record book and asked her: "How long is the sexual maturity cycle of this kind of oyster?" She picked up a cage and said: "About three years, which is about the same speed as someone changes their mind." The man paused with the pen in his hand. That night, a red tide alarm sounded throughout the breeding base. Lu Yan told her: This red tide may be man-made. And her mother's death was not an accident. Behind the breakup seven years ago, there was a long-planned family conspiracy. When the tide turns, the submerged truth will eventually surface.