Of course, it was not the first time Bai Chen had heard of the Wu Li Empire. Earlier today, he got a notification from the system when he saw the Emperor of Wu Li standing together with the Emperor of Dong Lang.
Bai Chen knew that Wu Li was holding an important part in this event, and it was no wonder that the soldier from before was anxiously inquiring about the Prince's well-being.
Yes, the soldier did use 'Your Highness' when asking the question, but the question was directed to the other Prince, not to Prince Bai Chen.
The second Prince of Dong Lang Empire also remembered how the Emperor of Wu Li said that his eldest son would participate in this event, and it was understandable that the soldier from before looked panicked when he witnessed how the precious Prince of Wu Li was willing to risk his life to save the useless Prince of Dong Lang.