Ye Xiu thought that Nie Li and Ye Ziyun already have a relationship.
Only that Ye Zong didn’t allow the two of them to be together,
which led to
the conflict
there after.
If this is the case,
then he has the need to convince Ye Zong to marry Ye Ziyun to Nie Li.
Afterall, the daughter has to be married,
no matter what and no matter how unwilling the father is.