It's a long story.
Yi Lin made a long story short.
After leaving Cows' Village with Bai Chuchu, Yi Lin went to the nearest Yecheng, where he visited a brothel.
On the city wall of Yecheng, the flag of the Southern King had long been flying, the colorful flags fluttering.
It was said that when the Southern King's army approached, the City Lord of Yecheng was the first to raise a white flag, declaring surrender to spare Yecheng from the ravages of war.
The City Lord of Yecheng, who opened the city gates, not only escaped being a prisoner, but was instead heavily utilized by the Southern King, becoming an important checkpoint along the logistics route. He set up granaries and armories in the city especially for the Southern King, proudly becoming a lackey.
To the ordinary people in the city, it didn't matter much who the City Lord was or whose flag flew atop the city wall.