Yiu Choi and his elder brother owned and operated an opium smoke and gambling house and later opened one on Shilutou. They offered Ng Chung So to hold his nightly classes in the back room of the house. Ng taught from the club for roughly a decade until he retired, and Yiu Choi moved him into his home and cared for him for roughly a decade in exchange for further training for himself and his son Yiu Kay. Ng Chung So lived and was cared for until he died.