Who is the teacher of the swallow in Princess Zhu Huan?

1 Before entering the palace, I learned martial arts from a master and learned half a bottle of vinegar. It seems that this person only has a surname, without leaving a specific name.

After entering the palace, the emperor asked Ji Xiaolan to help her with her study. Ji Xiaolan should be one of her teachers.

At the guest house, everyone got to know Meldan. Because of the injury, Meldan's martial arts are still superior. Swallows worship him as a teacher and learn from him.