The content of Su San's explanation

Yutangchun is Susan's stage name, but Susan is not her real name. Her real name is unknown. When she was five years old, musician Huai Su and his wife bought her from Datong County, Shaanxi Province, and began to train her. At the age of fifteen, she erected a colorful flag in Hulu Lane, Beijing, which attracted guests from all directions. Because Susan was born beautifully, she not only played the piano and sang, but also was good at poetry and painting, and soon became a famous prostitute in Beijing. In order not to let her have other plans, the madam never mentioned her family background to her, and certainly never told her her real name. Because she ranks third in the Su family, she is called "Xiao San Er". Yutangchun's stage name was given by a romantic scholar who came to visit when she debuted.

One day, when she met a guest, Wang Jinglong, Yutangchun changed her mind. She not only entrusted herself to the other party, but also dedicated herself to the other party. Wang Jinglong later took the exam to become famous. Susan was saved by Wang Jinglong and everything will be fine in the end.