It was bad luck for Han Yu. He had suggested adamantly to Cheng Jing that he should go to Ji Shan Hot Spring with him, but they weren't sure which hot spring hotel Master Yuanjing and his apprentices had chosen.
They had no choice but to send their servants ahead to search for any trace, which took them quite a bit of time. While there, they happened to meet the royal highness of Zhen Bei Marquis and his group of people.
Han Yu was not related to the royal highness of Zhen Bei Marquis, but there was actually a bond between them. The royal highness of Zhen Bei Marquis was the concubine's son. Since he needed to be the royal highness, naturally they had to make his title legitimate, so he became the wife's son and was raised by the wife.