Yiu Choi () first began learning Wing Chun Kuen from Yuen Chai Wan, the elder brother of Yuen Kay San, in roughly 1920 and studied with him until Yuen moved to Vietnam in 1936, just after the death of his Sifu Fung Siu Ching. Just before he left, Yuen introduced Yiu Choi to his friend and fellow Wing Chun Kuen practitioner, Chan Wah Shun, to continue his studies. At the same time, he also learned from Chan Wah Shun's student Ng Chung So.