Zhang Mutong, nicknamed "Pastime", is the son of Hong Kong stars Anita Yuen and Chile. Because it looks like a mother, it is also called "male version" by Hong Kong media.
In 2006, Anita Yuen gave birth to Csillam's son Zhang Mutong, and Csillam wrote a song for his son. Make a MV with his son's photo, which contains his fond memories of playing video games with his son in his arms.