Yang has been involved in Chinese-language theatre since the 1960s and became known for his work with the late director and playwright Kuo Pao Kun. In the 2016 M1-The Straits Times Life Theatre Awards, he won a Best Actor nomination for his role in the play The Struggle: Years Later, staged by The Theatre Practice.

| Title | ||||||
|---|---|---|---|---|---|---|
Love at Fifty | Uncle Tong | 0 | 2022-12-02 | 1.3365 | ||
As Quiet As A Cloud | 0 | 2022-11-26 | 0.689 | |||
Good Goodbye | 0 | 2024-03-28 | 0.2467 | |||
Wet Season | Ling's Father-in-law | 6.4 | 2019-11-22 | 2.013 | ||
Growing Up | 0 | 1984-01-01 | 1.3111 | |||
Kopitiam Days | 0 | 2025-08-05 | 0.4049 | |||
Singapore Veal | Ah Tan | 0 | 2022-11-26 | 1.1295 | ||
Luck My Life | Principal Wu | 0 | 2026-02-17 | 1.2072 | ||
Last Shadow at First Light | Ami's Paternal Grandfather (as Yong Ser Pin) | 6 | 2025-08-20 | 1.0069 | ||
We Are All Strangers | Kopitiam Customer | 0 | 2026-08-20 | 1.4072 |