Why do swallows want go to dali? Why did Yan Yong leave for two years? After Yongqi wrote 730 letters to Swallow, where did she go and why?

I went to go to dali because I learned that the emperor was the father-killer of Swallow.

Because Yongqi was forced to marry Xinrong, his mother recalled him to the palace. So I sent 730 letters to Swallow, saying that as long as he read them, he would come back.

Xinrong didn't have a baby. It seems that Swallow and Yongqi gave birth to two children. Yongqi and Xinrong are not complete.