Bai Shan, a 23-year-old Olympic swimmer, develops *dissociative amnesia* under competitive pressure - his mind erasing yesterday like waves washing away footprints. Each morning, he may wake up not recognizing Zhi Hao, his live-in partner who sacrificed his career to care for him. Armed with sticky notes, a resilient goldfish (their shared metaphor for memory), and relentless tenderness, Zhi Hao rewrites their love story daily. Their fragile dance between forgetting and rediscovery culminates in a twilight poolside confession: "When your memories reset tomorrow... will I still be your first thought?"