This story really feels like it's riding on a template, rather than have any idea it wants to explore.
Stupid greedy evil family, "real" family leads to a better life, the MC is heavily antagonized and behaves feebly, the MC starts off as a worm but blossoms into a butterfly....It just keeps running forward while making check-marks on every trope it can think of. The only thing missing, is that the evil family will be eradicated far off in the future (the very fact that they antagonize the daughter of a world-ending-entity is just mind-blowing level of stupidity..)
This is basically what the Chinese would be making, if they had any idea how to "pace" anything, and try not to produce anything that's printed on toilet paper.