"Of course! I love Lan Zhan so I'm glad we can have the day to make it official and nothing is better then being able to share that with everyone." He won't go into the complication of loving both of them because that is just too much to put on the son. But just saying he loves him to another person is slightly embarrassing even if the one he is saying it to is Sizhui.

"Both Lan Zhans deserve all the happiness to come their way." So of course the union of both fills him with joy. That man has gone through so much and a lot of his sadness and pain has been his fault. But despite that he still wants to marry Wei Wuxian and so he intends to make up for all of it.