How did Dajiangyuan discover that Xiaoman was his own?

In the finale, Derong learned from Xiaoman's father Xia Dong that he had made a mistake.

In fact, Xia Dong was bribed by Yao Xi and lied that Xia Xiaoman was his own daughter, making Ye Ximao the daughter of Wan Qishan. After knowing Xiaoman's identity, Derong decided to cancel Xiaoman's marriage with Zhuo Feng.

As for Zhuo Feng's true identity, he is not Derong's own son, but is actually a brother with Ge Hua (Wu Yekun).

Because Wan Qishan and his wife thought that their biological daughter was dead, they bought Wan Zhuofeng as their son.

Character image:

Xia Xiaoman, the adoptive mother was poor, and the adoptive father sold Xiaoman into a brothel to pay off his debts. At the age of fifteen, Xiaoman escaped from the brothel with Mo to avoid being hunted. Since then, the two have lived together like sisters.

Kaishan made an exception and entered Wanguan Garden as an apprentice. Xiaoman is determined to be a teacher in the sauce garden and be a small boss to get rid of poverty. De Rong was full of prejudice against Xiaoman because of misunderstanding, and fate played a trick on Xiaoman. It turned out that Xiaoman was Derong's own daughter and died of misunderstanding. When the mother and daughter reunited, Xiaoman still resented being abandoned and refused to recognize each other.