Bunnan began to get involved with a number of charities after WW2. In 1950, he was asked to be on the governors’ board at Po Leung Kuk, one of the biggest charities on Hong Kong who ran orphanages, women's shelters and schools. However, he was only interested if he could be the chairman, so Shook Ying took his place on the board that year. A year later, Bunnan got his wish and became the chairman of Po Leung Kuk. During his term, he pushed through the construction of several new schools for disadvantaged children.