What is the relationship between Jay Chou and Jacky Cheung? They are said to be fans. Xueyou is also the idol of some singers!

Jacky Cheung was the idol of Jay Chou. When Jay Chou was a student, she pursued girls and played goodbye on the piano to attract girls. Now Jacky Cheung also likes Jay Chou, and Jay Chou helped Jacky Cheung write a song called fortune telling. Jay Chou also mentioned Jacky Cheung in Listen to Mom. Moreover, at the 2007 World Tour Concert, Jay Chou invited Jacky Cheung to be a guest through video and sang "Listen to Mom". At the Hong Kong stop of Super Times Concert, Jay invited Jacky Cheung to be a guest again. In addition, Jacky Cheung also covered Jay's Star Clear at the concert.