Swordsmanship.
Actually, Ye Qingying didn't know why he taught her swordsmanship.
It was probably because life was indeed a bit boring.
Having lived for more than twenty years, he had long become accustomed to a solitary life.
Even though Yu Linglong would occasionally appear in his life, every time she did, it was only because she needed his help with something.
As an assassin, he had no friends, not even someone to talk to.
But recently, a little girl had become a part of his life.
A little creature who chirped and complained incessantly, to the point of being unbearably noisy.
Because she was too loud and troublesome, Ye Qingying could only find something for her to do.
For example, after finishing her qinggong training, he let her practice swordsmanship.
What surprised Ye Qingying was that this little creature actually had an astonishing ability to learn.
In just five short days, she had managed to learn at least eighty or ninety percent of his sword techniques.