Can I go to Hong Kong and then return back to china only using my EUpassport & chin mult entry visa

Hi, I am from Bulgaria(It is in the european union) and I don’t need visa for Hong Kong. However I am currently on a student X1 in China as I am studying at university in Hunan. I want to visit my friends in Hong Kong so can i just freely go to hong kong for 5 days and then freely return to china hunan without any additional documents except the ones i already have (my EU passport and my multiple entry chinese entry permit). Thanks!