鱼只忆七秒七秒全是你
[yú zhĭ yì qī miăo qī miăo quán shì nĭ]
This means 'A fish only remembers for seven seconds; during those seven seconds, all were about you'. Popular belief suggests goldfish have short memories, thus implying even with such fleeting memory span, the person was always thinking about another, reflecting deep attachment in limited capacity.