At the age of 18, Yuen entered the Miss Hong Kong 1990 pageant. She was a heavy favorite to win the crown from the semifinal to final. During the semifinals on August 5, 1990, she won the Miss Photogenic award. She had a semifinal score of 485, placing 3rd overall. The finals were held on August 21, 1990. She eventually beat out another big favorite, Helen Yung who was 1st Runner up and the winner of 2 other awards. Yuen later represented Hong Kong at the Miss Chinese International 1991 pageant after degree graduating, held on February 2, 1991. She took 1st Runner up for Hong Kong. She also competed at the Miss Universe 1991 pageant in Las Vegas, Nevada. She failed to make the top 10 and was placed 60th.