My Name is Yu Feng

Madam Gu felt like a hypocrite as walked out of the room. She had told Yu Feng that she should not continue to lie to the Prince, but the Prince was keeping his identity from her as well. 

As she stepped out of the room, the Prince was still waiting outside with an anxious look on his face. She could see that the Prince was really worried about the girl. 

Previously, she had seen the two's interactions and knew that Prince Yi really valued this friend a lot. Madam Gu saw that Prince Yi was at ease around Yu Feng and knew that he was comfortable with her. This was the first time that Madam Gu had seen her nephew's carefree act around someone else.

If he had exposed his identity as a Prince, perhaps the two would not be this carefree. Instead, their relationship would seem as if one was subordinate and the other was the master.