It was probably because there had been too many and too many things happening recently that she hadn't thought of Koo Changtine earlier.
There was also Ji Nanchen.
Ji Nanchen was the new master of the banquet. When he kidnapped Mu Yunxiang, Koo Changtine used this to threaten her to be with him.
He was Ji Nanchen's cousin, and Ji Nanchen was the new master of the banquet. Yuu Nanting used to be the master of the banquet.
It was impossible that the three of them had nothing to do with each other.
The doctor she met at the Feast of Bliss, Pavillion, was most likely one of them. Nine was Koo Changtine.
Koo Changtine had been hiding the fact that he was good at medicine.
But she should have thought of it.
When she fell into the sea and was seriously injured, Koo Changtine brought her to a place where her medical skills were lagging. The local doctors might not have the ability to treat her.