On the east bank of the Hengyang City section of the Xiangjiang River, there is a blue and gray late Qing residence, hanging in front of the door, and writing "Ouyang's former house". In the busy city with high-rise buildings, the ancient residence is like an old man quietly watching the city, witnessing the changes of more than 100 years. The owner of the old house, Mr. Ouyang, is Zeng Guoqi's father-in-law Ouyang Ningzhi.