How to understand this line in Big Fish Begonia

The person who gives you life is always the most precious.

"Big Fish Begonia" is a fantasy animated film, directed by Liang Xuan and Zhang Chun, written by Liang Xuan and voiced by Ji Guanlin, Shangqing, Timmy Xu and Jin Shijie. The film tells the story of young Toona sinensis, who is in charge of the growth of begonia, trying to revive the soul of Kun, a young human being, in order to repay his kindness, and with the help of the goddess Kun, fighting against each other's entangled fate. The film was released in Chinese mainland on July 8th, 20 16.

All living human beings are a big fish in the sea; They set out from this side of the sea when they were born. Their lives are like crossing the sea, sometimes meeting and sometimes parting. When they died, they reached the other shore and returned to their own world.

4.5 billion years ago, on this planet, there was only one Wang Yang sea and a group of ancient big fish. In the space parallel to the human world, there lives a well-behaved and orderly ethnic group. They work for God, and they are in charge of the running laws of all things in the world, as well as the human soul. Their sky is connected with the ocean of the human world. They are neither gods nor people, they are "others".

As the heir of the birth family, the young Toona sinensis is in charge of the growth of begonia flowers. Do not hesitate to violate the commandments of the people and go against the sky, secretly raising the soul of human teenagers-a small fish with a thumb in the underwater world.