After the megahit TV series My Fair Princess (1998–1999), he has had a successful career in acting, starring in dramas such as The Legendary Siblings (1999), Romance in the Rain (2001), and The Heaven Sword and Dragon Saber (2003).

In 2010, the Little Tigers were invited to participate in the CCTV Spring Festival Gala, in which they sang a medley of three of their biggest hits and won accolades as the "favorite singing group"[2] for the event.

Su's experiences describing his high school years, preparing for the Taiwan university entrance examinations while trying to also juggle his performing schedule as a member of a wildly popular singing group, are recorded in his 1995 book entitled My Days at Jian Zhong / Youth Never Die.

His later TV series include Heavenly Sword and Dragon Sabre (2002), Magic Touch of Fate (2004, costarring Taiwanese actress Ruby Lin and Korean singer Kang Ta), and Mischievous Princess (2005).

A Singing Fairy, shot in Guangxi Province, and a biography of Macau composer Xian Xinghai, titled The Star and the Sea, both opened in limited release in December 2009.

In December 2010, he won the "Best Actor" award at the 2nd Macau International Movie Festival, for his performance in A Tibetan Love Song Along with his TV and film success, Su has released thirty top-selling albums, starting as a member of The Little Tigers group.

In January 2012 Su performed, along with singers Daniel Chan, Aska Yang, and Will Pan, in the 2012 Fantasy Stars Chinese New Year Concert, MGM Grand Garden Arena, Las Vegas.