Mui had a low opinion of Tse until she came to know him during the preparations for the 1:99 benefit concert. After 1:99, Mui came to see Tse as a little brother -- much like Leslie Cheung saw Mui as a little sister. Reportedly, the first time Cheung and Mui worked together (on the film BEHIND THE YELLOW LINE), Cheung shared his hotel room with Mui when they were on location because Mui was afraid of the dark. Being with someone helped her sleep. The gesture fostered a deep friendship between the two. In later years, Cheung and Mui would try to book adjoining rooms whenever they were on tour or on location. Although rumours suggesting she and Tse were a couple annoyed Mui, she was determined to continue mentoring him. The Sun quotes Mui as saying: "The age difference between me and Ting-Fung is so big. I don't know how the rumour could even start. Do you think I'm still 18 years old. He's only 23! The rumours are really ridiculous