What is the purpose of a traditional Chinese wedding. The couple bows to the heavens (emperor), to their parents, and themselves. To show that they will be obedient to these people. HBY and SS are far from that type of couple. He goes against the emperor's wishes to stop investigating what happened to his family.
I felt they had a beautiful wedding. One that suited them. They are not like every other arranged couple out there. HBY was decked out in the same cape and outfit he had on at the Lantern Festival. She also had on her cape from the lantern festival. They are in a military camp in Hua County where their journey started. They are out under the stars (Love Like a Galaxy) . They pay tribute to the Huo family and the empress (who were their guiding forces) before they begin to tell each other their vows (33:00). The drama ends perfectly with the grandmother realizing how she had wronged SS and the emperor wanting to be a part of the wedding when he really didn't deserve to be, (but that is whole other issue).