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In 1997, Cai moved to Hong Kong and worked at a venture capital firm investing in media, entertainment and online business. She then returned to her hometown Beijing in 2002 and started her own public relations company called New Alliance. New Alliance worked closely on public relations among government, corporate and media organizations. Cai, along with New Alliance, managed the first annual Davos-like Boao Forum for Asia. In 2005, Cai joined Brunswick, a global public relations firm as a partner and specialized in financial communications and executive strategies. Some cases she worked on are CNOOC's Unocal buyout attempt and Geely's complete acquisition of Volvo.