Shan Yu was helpless.
He naturally knew what Traveling Doctor Liu meant, but he was helpless to even interfere in this matter. Not that he wanted to interfere either.
Both Chen Yuan and Nan Hua were stubborn.
And the two of them were very skilled in martial arts and medicine.
If he was not careful enough, he was afraid that he wouldn't even know when these two attacked him. Rather than interfering in their business, he chose to silently follow Traveling Doctor Liu and avoided those two.
This would help preserve his life longer.
"They might clash head on soon since the battle between Zhang Xu Kingdom and Fei Yang Kingdom is heating up."