Overseas Visitors in the City

A woman named Sun Chengxue hated men and deceived all the wealthy young men in Shanghai. She took the money and disappeared into the crowd. A woman named Sun Siyan came from overseas. She suffered some inexplicable harm just because she looked exactly like Sun Chengxue. In order to find out the truth of the matter, Sun Siyan came to Shanghai, using the pseudonym Sun Ying, and vowed to find Sun Chengxue to prove her innocence. It was just a huge crowd. Where to find Sun Chengxue?