I think the children are best suited to rule the country - all together - because they have empathy and put people first. They are kind and not power seeking.
I think Hai Yuan actually likes the grandfather. Could he be the wife reincarnated? That's why I think he did not accept Ze Fang's advances before. Anyone thinks the same? Or perhaps has another theory?
So how did the others gain from the air pollution? One selling more air purifiers and one having more people admitted to hospital? Not sure I understood how they gained to leave things as is.
I hope Boom's career will continue uninterrupted because she had a number of setbacks before and he had nearly given up. This looked like the right time. I hope they find a better partner for Boom. Good luck.
Apart from the bad acting and confused plot with unnecessary couples, I think their biggest foul was the 2 young boys kissing. And they should not show r$pe.