It's probably engagement) shortly1. LBY revenge, he killed many people2. LBY and SS broke up, emperor sand him…
It's different story, story of Ming Lan was about marriage life, but this story is not, I also hope at least see their wedding, but better lower expectations to not feel disappointment later (as novel finished without even wedding)
What usually happens in Empirical times the emperor marries an upright woman and it's the true marriage and then…
I read spoiler that consort Yue was Emperor long time sweetheart, they know each other from young age, but he also need marry Empress for political reason