That night the king was not the only one who confessed his feelings, Xichen was already officially fifteen years old so he wanted to make the promise he had made with A-Yue valid.
Now Xichen knows better than before how much he loved Lan Yue and he had also confirmed that his feelings were the same as five years ago and now they were greater.
In front of everyone, Xichen and Lan Yue asked for the king's permission to be together.
Xichen knew that the kingdom needed the next king, someone to guide and care for them, so he didn't want to neglect his duty for love, but obviously, he wouldn't lose the love for his duty either.
The king made a little show of making it look like he was angry but he quickly gave them his blessing and told them that he was already a bit aware of their feelings.
Being with Zhao all the time after he found out how Zhao felt toward him, made him learn to detect the expressions of others and he notice in Lan Yue some expressions similar to Zhao's.