After serving as Vice President of Singapore Broadcasting Corporation's radio marketing division, this businessman and entertainment producer was promoted to executive positions at both SBC and the Television Corporation of Singapore. In 1998, he founded a film production company called MediaCorp Raintree Pictures.
Early in his career, he established a company called Channels Marketing.
2013 saw the opening of Yun's ACT Academy training program for screen actors.
He grew up with three siblings, including a twin brother, Woon Tai Ho, who became the founder of Channel NewsAsia.
His production company, Raintree Pictures, co-produced the 2007 film The Tattooist. The film, which was made in New Zealand, starred Jason Behr.