In some Yudu love brain stories, the fish of the eldest princess will all carry the memories of those lifetimes when they were fishes (the magic changes some of the functions of Qianchenxiang). Everyone's love is overwhelming, so they all become love brains (the power is not as powerful as the eldest princess), but the prince-in-law has official requirements, so those with low official positions will get involved crazily, mainly because they want to engage in some heroic competition, without a main plot.
The eldest princess uses the default name and lives a free life after adulthood, leaving only the minor part.
Concept: Love makes people crazy