this is rather nice.
the emperor seems to love his wife so let them be together, Su Yang don't need to "catch them all"
but if she gonna stay for the Emperor the emperor should change and take care of her much more otherwise she could eventually end up the same again.
The princess has the best wishes of the empress, so she can go with su yang now. I wonder if about the time su yang must to go, the emperor dies and the empress will go with him.
I was hoping for a bit more in the way of imperial cucking. Having a soverign dao partner would be great about now. Especially since she has a special constitution. It would be wonderful if she was impregnated so that she and the child can follow along.