Yip returned to Foshan when he was 24 and became a policeman.[3] He taught Wing Chun to several of his subordinates, friends and relatives, but did not officially run a martial arts school. Some of his better known informal students were Chow Kwong-yue (周光裕), Kwok Fu (郭富), Lun Kah (倫佳), Chan Chi-sun (陳志新), Xu He-Wei (徐和威) and Lui Ying (呂應). Among them, Chow Kwong-yue was said to be the best, but he eventually went into commerce and stopped practising martial arts. Kwok Fu and Lun Kah went on to teach students of their own and they passed down the art of Wing Chun in the Foshan and Guangdong region. Chan Chi-sun and Lui Ying went to Hong Kong later but neither of them accepted any students. Yip went to live with Kwok Fu during the Second Sino-Japanese War and only returned to Foshan after the war, where he continued his career as a police officer. Yip left Foshan for Hong Kong at the end of 1949 after the Chinese Communist Party won the Chinese Civil War because he was an officer of the Kuomintang (Nationalist Party), the Communists' rival in the Civil War.[6]