it's an imperial measurement for human yearsnarration "nineteen years later" Wan Qin "I'm nineteen in fish years"
...
...
As opposed to being 19 in normal years?
Pretty sure it's from the Chinese flood mythsWouldn't be surprised if whole bit in the beginning about preventing a flood, and "incurring the wrath of the holy court" was taken straight from the story of Focalors and Furina
She can, but she's just scared of the deep sea. And if you're referring to that scene after the locket glows, lots of fishes gather and something heavy falls on her, knocking the wind out of her.And why can a magical water creature not breathe underwater?