In the final ending of Princess Zhu Huan 3, why didn't Wei Zi accompany the emperor on his southern tour?

I haven't seen swallows and sunny children for so many years! Lagerstroemia indica is really a pity!

But there should be various reasons why I didn't go, otherwise, I can't miss this life may be the "only" opportunity ~!

However, grandma Qiong Yao seems to have told the story of Wei Ziyanzi's child. If you have time, you can continue to watch. ...