Singapore passport visit between Hong Kong and China

Hi, I intend to visit Hong Kong on 13 Nov 2018 and will leave for China the next day 14 Nov 2018, but will return to Hong Kong on the 26th Nov and go back Singapore on the 28th Nov. Do I need to apply Visa as my duration in Hong Kong is 5 days ( 13 to 14 Nov & 26 to 28 Nov) and China is 13 days ( 14 to 26 Nov)?