The music video of "You Are the Best in the World," a duet by Adam Cheng and Karen Mok with Stephen Chow adding background vocals. The song is for Chow's new film "Mermaid" and is a cover of the popular old song from the 1983 TV series "The Legend of the Condor Heroes." [Video courtesy of Stephen Chow's"Mermaid" production companies / Official release / China.org.cn ]